Sadly, i would say Sonic 06. None of the bugs in Skyrim were gamebreaking. Sonic's ones were detrimental to the experience, even though the premise was quite cool.
I still think it would've been a loved game if it hadnt been rushed out.

Glitches that are hidden? Zelda: Ocarina of Time. Seriously, the fact that you can beat that game in less than 20 minutes should be enough proof on how many glitches that game has. By far the most broken game in existence if you know what to do.

Glitches that appear just by walking? Fallout 3, non of them are game breaking, but they are annoying to say the least.

Expansion to Gothic 3. Easily the worst piece of work ever done on any RPG.

batman Arkham Origins. The only time bugs killed my save

I haven't owned an X360/PS3... and when I buy PC games they are a few years old (thus pre-patched) and I haven't played Skyrim.

So the Mass Effect 2 neck problem is the only major glitch that comes to mind (as well as sometimes getting stuck in odd sections of the map).... I have after extensive experimentation found the odd map drop off in GTA and Burnout, but I don't consider that as severe an oversight by testers even if it effects the play more.

I've played many glitchy games. Seek and Destroy (PS2), Crash Tag Team Racing (PS2), Tony Hawk's Proving Ground (Wii, but there are some glitches on PS3 as well), are some of the games that really should have had another three months of dev time. Skyrim PS3 as well, but that was fixed. After two years.

F1 2013, unequal cars online, ghost cars and invisible walls bleh

AliensCM comes to mind right now

Also Aviggo77 you know if you started your thread names with a Capitol letter it wouldn't be obvious from the front page they were your threads :D They are just kinda easy to stop, not that it's a bad thing because I like reading peoples answers to some of your strange questions.

Mass Effect 2

Skyrim

New Vegas

Uncharted 1