Disclaimer: my highest level character is currently level 20, so I haven't quite hit Epic level play. I'm planning for it though.
What I like about the Epic rules is that things don't instantly change. The power progression is pretty even. With somewhere between 1 feat/3 levels to 5 feats/6 levels depending on class, you won't suddenly become a world-destroying monster. The biggest potential for abuse is the Epic Spells combined with lots of cash and some skill-boosting items, in my opinion, but that's because they are open-ended. On the whole, it's just a continuation of the characters, with new abilities opening up.
--Seule