That's hard... my first and true love will always be the charater generator. The combinations of costumes and power combinations leaves so much for one to play with.
I also dabble in PVP.
Bases are like cell phones. I never knew I needed one till I had one. I never knew how great it was till I forgot it (or in the case of bases, it disappeared for 1.5 months)
I can see why bases aren't a favorite... they just sit there most of the time and the one "really cool" feature seems destined to never work (CoP) but the utility of it can't be matched.
