Now, here's the thing. I know that the game has it's flaws; the storyline's silly and to be honest, many of the bosses didn't need a one hit kill attack. But I don't really see the huge deal with the overheating thing. When you go automatically go into bullet-time because things are too hot, you're supposed to take the opportunity to get yourself into a position where you'll be protected from attack while your health and heat bar regenerate; not where you should still be in the line of fire while you're waiting.
I'd also like to bring up that, while the game's campaign is short, it's got high scores and leaderboards; it's not a game that you're going to master the first, or even the second time through. That replay value certainly works in the game's favor. Whether or not the concept of playing a game multiple times for gradual improvement is just as compelling a goal as beating it is up to the player, but if they fall into that niche, I think Vanquish will be a blast for them. It was for me, anyway.