If you don't have a scummy welcome mix-up then the only thing you're doing is giving your opponent XF2 and 5 bars, by using this. Characters that can reset at will, probably will get the most benefit out of this, since they won't be giving their opponent extra resources for using the infinite fully. Then comes the characters that kill fast enough where their opponents still don't have enough time to get much. Similar shit with MvC2.
Zero starts the round, gets a hit, goes through the motions and either lightning loops you to death or uses the "unblockable tac" to switch to Magneto. Magneto starts doing his thing until the opposition starts gaining meter. They drop the infinite and reset the situation (depending on the assists, his resets get really ridiculous). Say you survive, and land back on the ground. Your screwed yourself, since you're going to have to block. If he has drones, pushblocking won't help you. If he continues with the infinite, then you get resources, but you're going to have to guess which side you're coming in on. Get hit, then die via XF Gravity squeeze or DHC to Zero. Of course, he can just raw tag back to Zero and force you to block lightning.
Morrigan can do the same shit, except she can put you in bullet hell or drain your meter...