I'd do it just for the save file. I'll be honest, though, and admit that I've deliberately steered clear of any news that tells how your save file might affect ME2 - I want to learn that through play. But really, aren't we all playing videogames for the feeling of having some effect on the game world? This kind of interactivity between games is nifty. Even if it only comes into play a couple of times it'll still be awesome.