I did a fullset one time with the original Xbox. I enjoyed doing it because there wasn't a complete list of Xbox games that I could find at the time to make a fullset simple to do. Believe it or not, I actually enjoyed doing all of the research and cross-checking necessary to make my list accurate. Finding them all was sort of fun too - I guess.
But once it was done, I realized that having a hundred or so games who's titles start with NBA, NCAA, NFL, MBL, NHL etc. was kind of boring to me. Thank God the Xbox wasn't heavy into games involving music, dance mats, or karaoke mics. YEEESH!
Not that I was expecting it to, but when it was done, it never impressed a single person who's seen it. I'm the only person who knows what was involved in accomplishing it and that's the satisfaction I derive from it. But I really can't see myself doing it again, honestly. Apparently, I don't have a collector gene in my body.
Nowadays I limit myself to genres of games that interest me the most. I find that if the subject matter interests me, I don't give a shit if anyone else thinks the game is good or terrible because I'm doing something in the game that I enjoy doing. Mostly just shooting shit and blowing stuff up, maybe a little hack and slashing. Sex sells, of course, and if a title finds itself on some crusaders shit list for WHATEVER reason, then I definitely feel I want to have it on my shelf.
I try to keep my favorite genres interesting by being willing to track them down no matter what region of the world they were released in. Figuring out what's been released and where and then trying to get my hands on it seems to be just as fun to me as actually playing games.