Yep, but then they get beat by characters like the Fury or Strange and then we go
"what happend to all of that Multiversal altering power in BATTLE?"
t:
Wanda's powers weren't fully under her control in Disassembled. Which was how Strange was able to stop her then, and only then. By his own admission, he failed to stop Wanda in House of M and thus his duty as Sorcerer Supreme, which is to prevent or stop such catastrophies.
Although her mind was still a mess in House of M, she was able to control them to a certain degree. Although, one could say that they are tied with her emotional state. When Quicksilver was nearly killed, Emma said that provoking Wanda at that point would have resulted them being wiped out of existence without her knowing it. And then there was "no more mutants".
In a battle, depending on her emotions and state of mind, she'd most likely self-destruct, taking the opposition and perhaps reality itself with her.
Fury is arguably the ideal non-cosmic threat against a reality warper. Created by one, rendered to be immune to reality warping, and active adaption like A.M.A.Z.O. in JLU.
You mean when he traversed the dimensions to find the In-Betweener and steal his Infinity Gem? Indeed, he was able to withstand the stresses. But it'd be a huge claim to say that Thanos could withstand being altered by powers like the HOTU or the IG.
You mean the feat with Torquasm-Vo?
Hell even Silver Surfer I believe resisted the SOUL GEM(which could fall under reality warp)!
Reality warping would be the Reality Gem. Soul Gem is the soul.
Maybe maybe not. We will never know until we see a fight.
Outside of writer's ignorance/stupidity, you can't seriously consider the possibility of Hulk defeating a power, like, the HOTU?