I like how some servers restrict EE2 items to make it fair, f.e Mk1 collectors and relays, a couple of the rings are gone (void I think? I don't really know the rings), destruction catalyst modified to obey towny rules etc.
I like IC2 as it was the first mod I learnt how to play with, and just the general tongue in cheek humour of the wiki is funny as well. EE3 with the red liquid that burns you (check out the Minecraft Forums interview with Pahimar a few months back for decent details) looks like it's gonna be a better mod than build a collector, have diamond block mansion in 2 hours.
A bit annoyed the catalyst is going, but oh well.