I would normally buy alot of games(mostly on sale) to just collect the good/interesting one but not actually play them.
So I'm not the only one who does this.
Hehe me too! Glad i was finally able to read thru this thread in its entirety. I avoided it at first because i knew i'd end up remembering a ton of games i need to go back and finish, and have the urge to just unplug my computer to keep me from posting about the urge to finish games, and just go and do the damn thing. I'm at work now and its really dead here, so i don't mind reminiscing.. its supposed to be like 80 degrees when i get outta work and instead of being out enjoying the nice weather, i'll probably go home and play me some GC backlog! Thanks guys

I have a few of the same games as you on that list, lets see if i can remember all the stuff i need to finish:
Pikmin 1 (near the end)
XII* (stuck at the last boss fight who can kill you in like 3 shots)
Geist (also on the last boss. I think endure this fight but i just don't land enough hits to get this geezer to die!)
Killer7 (will play from the beginning)
Star Fox Adventures (played for maybe an hour. I wanna see what all the fuss is about)
Star Fox Assault (i've done a quick play thru on normal difficulty, wanna try to get all the medals etc)
DK Jungle Beat (played the first level or 2 with my gf and havent touched it since)
Donkey Konga 1 & 2 (i'm a completionist so i'd like to one day unlock as much as i can)
F-Zero GX (can't finish that freakin story mode! I'm like on the 5th chapter or so)
Mega Man X Command Mission (beat the game but there are extra bosses i haven't beat yet)
Mega Man X Collection (Haven't yet finished X5 or 6, can't remember. Those games get progressively worse, sheeh)
Hmm thats all i can think of for now, i'm sure theres more. Alot of these games i bought second hand only last year, so the reason i haven't started some and finished most is because i'm trying to juggle those with all the Wii games i have yet to finish! I'm sure that if i got some of these titles back when they launched, i would've given them the time they deserved and enjoyed most of them.
*XIII isn't THAT bad. It was interesting enough for me to put it down after borrowing from a friend, then buy it (for like $3) after i returned my friend his copy, then come close to finishing it. It had a decent balance of gun play and stealth, with the stealth sections being more fun than MGS:TS, though much less forgiving. I hope someday to finish the damn game, but who knows.