I've noticed they use the same, or at least similar characters, and then give them the same moves as what somebody used in a prior game.
I'd like to see new moves, and well, you know what I mean. You're just paying for the same thing otherwise.
I've spent about a gazillion hours with fighting games.
And I tell you this: Even the most diehard fans often feel this way.
There was one notorious example, in the Blazblue series. A totally new edition came out, right?
Know what it had?
One new character. ONE. Did I mention this was a full retail release?
Unfortunately the genre is like that.
But if you want to see the worst of the worst...
DEAD OR ALIVE 6 on Steam
Scroll down a bit, where it shows a short list of DLC. Click "show all". And witness the greedsplosion that follows.
I've said this before, and I'm going to say it again:
EVEN EA WOULDNT DO THAT.
And when the devil himself is unwilling to go so far... you know you've gotten nasty.
Now, that all being said, there is one crucial thing to consider: having "the same" special moves in different games isnt really a bad thing. Think of it as double-jumping in platformers. It always works exactly the same, it's never new, it's repeated everywhere. But this is because it's a great mechanic that just WORKS.
It's the same for things like Ryu's Hadouken, or his Shoryuken. Both of these are moves you will see in MANY games, not just in Street Fighter. Not because the devs are trying to be cheap and copy things. But because they are "core" moves that are just sort of fundamental, if that makes sense.
No, the point at which games start to feel scammy is when they do things like, you get a "OMG SUPER EDITION" and it does something like add one character, or maybe it doesnt add any and just tweaks the balance... that sort of thing. The Street Fighter series is notorious for this. But having shared moves across entirely different franchises? It's normal. Every game genre does this, whether their fans want to admit it or not.