OK, first of all, the Thing looks like he escaped from a Wallace & Gromit cartoon, The Invisible Woman looks like an extra from a Motley Crue video, and Mr. Fantasic looks... well... not so.

I can almost understand making the Invisible Woman's force bubble not actually invisble, but why in the world would it have the team logo on it?

These are just a few of the reasons these guys could not get someone to Human Torch for them.