I can't stand alternate realities, but strangely enjoyed House of M as well. The art was gorgeous!

Does Earth X count? That was another fantasticly gorgeous alternate reality series that was really good.

As for stuff I DIDN'T like, I wasn't a big Secret Invasion fan, and while I loved Planet Hulk, World War Hulk just felt like it was an event they had to get out of the way - dealing with the Hulk's return.

I also didn't care for Maximum Security. Likewise, Onslaught just seemed to be an excuse to reboot characters rather than be an interesting story. Anyone who knocks Secret Wars II for sucktitude obviously didn't stick around through the mid-to-late 90's. :P