Well, it was to be somewhat expected. I was watching a livestream of someone playing and what looked like the importing of the ME2 save file corrupt. He said that he spent over 70 hours playing ME2 and the save won't even work with ME2.
I was thinking of getting ME2 and having a quick playthrough on the 360, but seeing this little hickup, it's turned me off the idea.
Please, do not take my post as some sort of confirmation that all saves are corrupt/will be corrupt. This was the first I've seen/heard of such a thing and it's a mere coincidence.