Whilst you're welcome to your opinion fatknacker50, MMX was reasonably well liked. It wasn't the pinnacle of the series, but it was far from the worst. I know that as an M&M fan, I was looking foward to a reply in due course.
The main flaws as I saw them in MMX were…
1) Four characters didn't give enough room to experiment with all the combinations. Six would have been nicer.
2) The world could have done with being about 25% larger.
3) Could have used more links to older M&M games
4) It needed a way to respawn monsters somehow - the world got progressively more empty as you explored, and once you'd traveled around getting the best gear, there were no enemies to use it on!
5) Minor - modding was theoretically possible, but required an expensive devkit. Fail.
6) As we've discovered, DRM
7) Graphics driver issues with modern drivers/gpus, although these aren't fatal.