I wish I hadn't bought GRAW2. I despise it. I despise the sight of it. I don't know how I managed to beat the (short) single player campaign, but I did. I tried the online, it sucked.
I would say Ninja Gaiden Sigma (I couldn't even bring myself to beat it) but it was on Greatest Hits and discounted, so I didn't waste AS MUCH money.
I'm going to try and sell them second hand.