Mass Effect is the only game I ever played where I read -every single entry- of lore in the encyclopedia. First game with achievements I did 100% on as well. I built my own Normandy models, even... both of the SR-1 and -2.
I hope ME4 is a return to form when it releases. I also hope the TV series I've heard about treats the franchise well... The story would do well as a prestige title IMO so I'll be super bummed if they don't do it justice.