while i don't mind a lot of the larger venues, for the ocassional show, nissan pavillion just needs to go. i can't think of one redeeming value about that place.
the patriot center can be a royal pain in the ass, but depending on the show, the sound can actually be great. it was for david gray in january. 'course getting there and back without a car is an adventure.
mci center, obviously for me, is easy as hell since i live 3 stops from there, esp when you buy your ticket half price from some guys because their friend is too hungover to make it to the show and they need to get rid of their extra ticket.
bender arena has mediocre sound. wolftrap is great, but i think its more the concept and whole package that makes it such an enjoyable experience.
and if you've been in dc long enough, you have a certain affinity for rfk. its just nostalgia.