Eternal Idol
Lono, "The Dog"
The Champion and the Juggernaut should never lose to anyone who is not at least herald level and lacks power versatility.
Ares should be written as a cold and calculating type who won't get his hands dirty unless he has too. Much like with Wolverine, he should be shown to use more skill and less head-first berserker charging.
Captain Ultra should be revealed as the fourth face of the Living Tribunal.
The Shocker and the Rhino should be kicking much more ass than they do. A revamp emphasizing each's personality as cold-blooded killers for hire would help.
Colossus should take it to another high-level brick, and eventually knock him out via fisticuffs. Finally get him a legit and undisputed victory over some big name, without the rest of the X-Men's help.
Would like to see Deadpool's zany antics toned down a bit. Sometimes it gets over-the-top ridiculous, and at times, it's not even funny. Hard to take the character even semi-seriously, even if it is Deadpool. I'm sure X-Force is working on that though.
I feel like Xavier's been chumped lately. He doesn't come across the inspirational founder of the X-Men, or even the world's most powerful psychic to me anymore. Xavier needs to take charge of something without coming across as a dick, and save the day once more.