I got Sonic '06 and Shadow too. And Sonic and the Secret Rings. What the hell was I thinking? At least I didn't keep them long, and it's been years since I had them.
I also bought Two World Limited Edition on pre-order. Worst fucking game I've ever played. Also got rid of it quickly.
I don't really have anything much currently in my possession that would qualify though. It's been a long time since I became savvy enough to know what game was most likely going to be shit.
Although actually there is one. Fable 2. The number of times I've mentioned that game on these forums has been way too numerous. But I've been away for a while so I haven't actually thought about it in ages. But I have the limited edition of that still sitting on my shelf for some unfathomable reason.
I have a few other games that are "bad", but I don't necessarily regret buying.
One other does come to mind actually. One that's not on my shelf, because it's a bloody non-refundable download game. And one I got recently too. I kicked myself so hard for getting this. Tales of Vesperia. It was yet another failed attempt to get in to JRPGs. I remember playing the demo way back when and being impressed, so on a whim I decided to buy it. Huge mistake.
Acton Hank said:
The most recent for me is Sleeping Dogs,
I was bored to death by the end of the first two hours.
That's the first time I've heard anyone say anything about that game which isn't showering it in praise. At least I know I'm not alone in not being too hot on it.