I've played both Iron Man games. Iron Man 2 is definitely easier than the first. I feel the controls are worse in Iron Man 2 which adds to the difficulty a bit. It is still very possible to beat even on the hardest difficulty though. Once you play it on easy or normal difficulty, formidable shouldn't pose too much a problem.
Impossible: Not hardly
"Your genes don't decide your destiny... You do."
Roxy held me down and forced me to drink bleach while singing "I'm A Little Teapot." Then I had to write an 30 page essay on double posting being a gateway into terrorism.... I learned my lesson. She broke my nose and told me to kick rocks anyways.