Anything that needs a constant internet connection that's not a MMO, but so far the only thing like that would be D3 which I bought on 360.

DRM like a code number or disc in tray don't bother me. I guess Steam is DRM but the few games I have there were bought cos of the price being incredibly cheap.

Settlers 7 when it was always online. It is fine now that it has been dropped to normal UPlay, not the best Settlers game, but not bad either.

Other than that... I stopped a couple of times when I noticed Starforce but that is more or less it.

Tons of them. Thankfully, I didn't have to skip them completely, as there are DRM-free copies on thepiratebay ;)

Diablo 3 springs immediately to mind. I completely ignore the Assassin's Creed franchise simply due to Ubisoft's always on-line requirement (I realize some or all of the games have been released from that, but I honestly have no desire to figure it out). There have been a few others, but I can't recall them offhand right now.

More often than not though, I simply wait until the game is on a deep discount sale. I refuse to pay full release-day price for anything shackled to a client, even though I have both Origin and Steam on my machine. There are a long list of those. But I do refuse to buy any single player game that requires always on-line, discount or not.

Any Rockstar game which needs RSN, any Ubisoft game which requires UPlay and always online, any post Warcraft 3 Blizzard game, C&C Collection.

I don't mind basic-level DRM, to be honest. I don't have a problem with registering software, using the Steam client, counting installs, or setting up an account (though that latter is getting close to irritating me). I can even deal with the "phone home" mentality of games which have an on-line component, though I prefer it when they don't.

The always-online thing baffles me. I accept it with Steam because, frankly, I've found Steam to be reliable and fairly quick to respond to Support issues, and because I think achievements are OK and trading cards are downright fun. Basically, I trust them. I might or might not have picked up Diabl0 3 and SimCity - D3 interested me - but Blizzard's wallet-always-on-line approach turned me off (SimCity was less interesting). I bought the older Assassin's Creed games on Steam, figuring I was always online with them anyway, and haven't played them yet so I don't know if it's an issue for me.

I prefer DRM-free, but if it's a make-or-break on a game I like, only the more onerous DRM will realistically stop me from buying.

Very nearly all of them.
I only own two games that have DRM (that is, any kind of internet activation/registration, not regular copy protection), Bioshock and Torchlight 2. I didn't even buy the latter myself, as it was a christmas present.

I've opposed stuff like Steam from the very beginning, no matter how many games I miss out on. (Seriously, I really, really want to play Far Cry 3: Blood Dragon, but it won't happen as long as it requires Uplay.)

Almost none I think.

There's been games I delayed buying because of DRM (sometimes for very long), but once they're cheap enough I'll generally have a go. It doesn't stop me from buying them entirely.

The DRM I let push games back the most is the one with 3 or so activations probably (doesn't regen them), then always online (I have solid internet though so i buy them at times), then rest.

DRM alone is almost never the sole reason behind my (non)purchase of a game though.

Not many - Diablo 3 and Sim City come to mind immediately - but everything else is multiplatform these days so that should Steam/Origin/UPlay use be required on PC, I simply fallback to the PS3 or Wii U versions.

I've skipped on Age of Wonders 3 for the time being owing to the retail version requiring Steam, but I'll probably pick that one up on GOG when it sees a very heavy reduction in price.

Diablo 3
Every GTA game since San Andreas

Those are the only ones that immediately spring to mind. There are plenty of other games I probably would have skipped due to DRM, if only I had actually been interested in them.

X-COM
Might & Magic X
South Park: Stick of Truth

Any game I would want for SP requiring always online (such as Sim City, Diablo 3 and Splinter Cell Conviction)

I was thinking of buying GTA IV when it was on sale a few days ago, but I read that it still has GFWL and that was enough to end any interest I had in buying it (at least on PC).

Well, I caved in all notable cases, at least when the games became cheaper after a while, but there's been a few games that I didn't even consider buying due to their DRM until they became dirt cheap - despite being otherwise interested in them, of course.

By now I don't have any more issues with Origin than with Steam but after the big initial outrage I decided to never buy an Origin exclusive like Battlefield 3 or Mass Effect 3 (despite having enjoyed past BF games and especially the original Mass Effect). I only tried BF3 when I got it through the Humble Bundle, wouldn't have bought it otherwise (although I would be willing to buy Origin exclusives after I actually got to try it). I also didn't buy Red Alert 3 for ages due to the DRM, only when it was down to 3 or 4 € on Steam. Oh, and I didn't consider getting BioShock due to the weird issues with the executable not being present on the disc but rather being downloaded during the installation or something. I think the version I ultimately got pretty cheap didn't do that anymore.

A couple of people have mentioned GTA IV. I knew it had DRM but it sounds like really NASTY DRM.