Do you know why Megaman was cut? And what are these fillers? Let me know and I'll see if I agree.
And your fanboyism is showing.
Rumors say Megaman was cut because he wasn't unique. The official talk was because they'd have to recreate the character (they are doing that with Jill) and he'd have to have a lot of moves (Dante has 40+)
Here are the fillers. Note that what I'm calling fillers are characters who aren't important on their own or they are lacking compared to a lot of choices.
Trish-No one actually likes her. She's just there
X23-A lot of comic book fans hate her
She Hulk-Hulk with boobs. There are more people from the Fantastic Four who would be better....
Super Skrull-A replacement for the Human Torch. Rather than use a recognizable character, they went for villain you probably don't know (they added him because he could use all the Fantastic Four's moves. Unique=/=good)
MODOK-Comic books are know for their good villains. MODOK is one known for losing. Not a good villian. Also, obscure and too weird
Sentinel-Only added to please tourney guys. No one actually wanted him
Hsien-ko-WAY WAY out of place. She doesn't fit in with the rest of the cast and there was no need for three Darkstalker characters (Viewtiful Joe deserved more characters than what darkstalkers got)
There are likely more on the Capcom side. I'd argue Akuma because Bison was in higher demand and there are some people who don't like him being too close top Ryu, but some people like him.
The big thing I see with the roster is the NEED top put female characters on it. There are fans out there that demand having more female characters, so the developers listen to them and put in characters who are, indeed, women, but who aren't that great and there could have been better characters. Note they added these characters and we didn't get Venom, Gambit, Cyclops, Megaman or Captain Commando, all characters people wanted, have been in the first two, and were important in their respective series. This is the reason I'm glad Sakurai picked Wolf over Krystal.