Why is everyone so crazy about Jalter/Merlin?

People like Jalter because because she has massive stats, great skills, great synergy with farming monsters like Kiyo and Salter, and only has class disadvantage against the more or less irrelevant Moon Cancer class. Her NP also provides the rare and powerful Negate Buff effect.

People hold Merlin in high regard because his skill set is basically just Waver on cocaine. He has teamwide meter charge, team invincibility on demand, and a crit/buster buff, all on very forgiving cooldowns.

Well in terms of gameplay : Jalter has the highest damage in all the game so far, maybe she doesn't hace a good NP alone, but she can fill her NP while u are supporting the party thanks to the avenger class and can be successful spamable, and at least has a invincibility skill with búster damage that can even be used in early stages of a mission only for raw damage and be greedy with ur arts team (not like artoria) , and if u buff her damage with 10% like 5 times or more with merlín,waver or anyone plus the combat suit u are saving a lot of damage to one shot kill anyone thanks to her high damage and despite she doesn't have class advantage against most of the enemies she still has a high damage alone , and with her deck u can either make crit burts and support ur team with NP spam and arts chains , that's jalter so far , is cheaper that having 7 servants of each class. Also can instant kill most of any berserker with 1 hit.

Now merlín: Free stars , easy spam, doesn't need crits of CE's for fill his NP and support the team AND i guess u already know why wivern is so good , is due to his skills that fill the party NP but doesn't heal the party but just like merlín he can fit in any team, so u can make an invencible team spamming merlin's NP + Mashu or hans and make ur damage dealer god-like thanks to héro creator and of course his best skill , make the party invencible.Then if u combine that u will have arts chains almost every turn with (8-10) arts cards , u can fill wyvern's NP to "stop" the enemy for 1 turn and wait for merlín's or wyvern skill for defense.

Now just imagine the memes, here's a link for example (warning spoilers ahead)

https://youtu.be/5B4qQsFSxKg

It's not like the game is hard it's just that both Jalter and Merlin pretty much are Meta Breakers or at least Merlin is.

Jalter even in the JP server which is 2 year ahead of us is the most powerful servent that you can get in terms of pure Atk Power.

To put things in to prespective on how strong her base Max Atk Power is compared to second place is.

Jalter Atk: 13,244
CuAlter: 12.085

Merlin on the other hand is without a doubt one of the most meta breaking character to be released in the game.

Merlin Skills if Maxed to 10

His First Skill
Increases party's attack for 3 turns and
Np Charges the party's NP gauge by 20%.

His Second Skill
Grants party Invincibility for 1 turn.
Increases party's critical star generation rate for 1 turn.
Reduces all enemies' critical attack chance for 3 turns.

His Third Skill
Increases one ally's Buster performance (50%) for 3 turns.
Increases their Max HP (3,000) for 3 turns.
Increases their critical damage (100%) for 1 turn.

And his Noble Phantasm is this in level 1

Garden of Avalon
Eternally Secluded Utopia

Restore HP of all allies per turn (5 turns) (1,000 Hp)
Increase NP Gauge of all allies per turn (5 turns) (5% NP Increase)
Gain Critical Stars per turn (5 turns) Overcharge effect (5 crit Stars)

Seeing this kit and Np he has can you wonder why people want to save so much quartz?

Merlin and Jalter are a little overrated in my opinion.

Yes, i do own Jalter myself and I do plan on rolling for Merlin; however, there seems to be an over the top regard surrounding the "overpoweredness" of Salter and Memelin. The reality of it is; their strength is completely reliant on team composition and without the proper servants, you can't reach the full potential of either.

1. Jalter is by far the best servant in my roster (quite flexible with her class too). When Shinjuku comes around, Jalter won't be able to 1shot bosses anymore due to DW introducing multiple HP bars on a single enemy. Her burst potential is strong, but it's significantly less powerful since overkill damage doesn't transfer over to the next HP bar. This means that she'll have to survive for a couple more turns before she can charge her NP again (keep in mind she has the lowest SSR health pool and can get nuked in a turn or 2 with RNG enemy focus). If you build a team to keep her alive, then her burst potential further decreases due to most supp servants lacking a 3x buster deck. If you build a heavy buster/crit team, then you can get damage off more efficiently but lack survivability needed to keep your carries alive.
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2. Don't get me wrong, Merlin is stronger than a Waver if placed in a proper team, but the same can be said for a Waver:

-----Merlin: Goes well in buster/crit teams and high dps stall comps thanks to his buffs out-doing a Waver in this regard. Merlin definitely keeps the team healthy thanks to his NP & 3rd skill (3rd skill is situational since you either choose to heal a servant or buffs a main damage dealer) as well as his 2nd which can completely ignore AoE/solo-target NP damage.
-----Waver: Goes well in NP-spam comps, Arts teams, and Arts/stall comps. With a proper setup, he can outshine a Merlin. Waver can fully charge a servant's NP in 1 turn given the right CEs (something Merlin CAN'T do unless someone has a maxed Kscope; waver can do this with a multitude of mana oriented CEs) and provides a party wide DEF buff that negates damage that would otherwise require healing (i.e. from Merlin's NP/3rd skill). Waver's NP works similarly to Merlin's 2nd skill (decreasing NP charge & debuffing vs. Negating NP damage), although lacking a skill that will save your team from an AoE NP.

Some people play trying to stick with the meta game.They want to have what some people think of as best servants, so those big hitters like Jalter/Merlin. Others people do save alot for servants trust me, I just dropped 500SQ on Tamamo Lancer. Illya is next on the hit list for me, I just save for servants I like.