I would have many to list, but I'll keep it short(ish):
º The Witcher ED DC (GoG version)
I still have my original saved-game-in-progress untouched since the last time (approximately five months ago or so). I sort of like the story, or rather the way it unfolds and is being presented. It's slower-paced than the RPGs I'm used to play I'd say but it's "ok". What I just cannot "get into" is its combat system. I just can't. I've tried, believe me. I'm playing the game in very short bursts when I feel like continuing for the story portions... then I realize I have to fight again between important triggered scenes and I quit out of boredom (it just feels unintuitive and clunky).
º The Witcher 2
Quite a significant improvement on almost all aspects, but again still haven't finished it, current game-in-progress is probably a year old by now. Once more, the combat system just doesn't cut it for me (it's "better" than the first but... I don't know... it's not "intuitive" I guess). I do plan to finish it. I'll probably finish it before the first, heh (and yeah playing them separately, not importing anything from the first to the second).
º Crysis 2
Got it from some Humble Bundle, played it until I "enter" the city (probably the second level?) and got bored. I admit that when I played it I had way other things in mind and was distracted. The thing is I just never found the "will" to start it up again since then, and do not feel compelled to as of now. But I probably will give it another go some time.
º Empire: Total War.
I've really tried to at least play one full (and successful, of course) campaign. I couldn't, each time I stopped playing after maybe 15 Turns or so. I just don't like the timeline (should have known better before buying it; I was honestly hesitating more than usual, I knew it was a risk, oh well).
º RAGE
Really liked the animations and the A.I. wasn't bad. But the story was rather poor (at least up until the point I'm at), the atmosphere "lacking" (doesn't 'feel' that post-apocalyptic to me). It was way too linear (essentially no exploration) for my tastes even though I was ready to "accept it" as another linear FPS with a story (say... like Half-Life for example) but the problem is the story didn't feel compelling at all, no will to continue to see what's going to happen next.
I don't really plan to finish it, to be honest but maybe one day if I'm really bored I'll give it another try (I don't mind the graphics though, they're fine by me).
º The Walking Dead
I sort of knew what to expect when I bought it. I knew it wasn't really "a game" per say, only based on quick time events-style decision-making concept thingy (ok, "interactive story" is another way to put it). Not really sure as to what I didn't like... I don't "hate" it at all. It just feels... slow? I guess? I played until the main guy and the girl got to a farm, with a farmer and his son there and... humm... can't recall what happened or if I actually finished that part (actually I think I did finish it... I have a flash-back right now of a young man getting grabbed by a zombie near a tractor because I decided to save the life of his brother or something like that...).
I'll probably give it another try some time. And, side note, I recently watched about 15 minutes of game-play of The Tales from the Borderlands (another Telltale game), and I'd see myself playing that one more often I think over The Walking Dead. Then again the last "zombie game" I enjoyed was the original Left 4 Dead (and the second one to some degree, still less than the first). Never been a big fan of zombie games (or movies, too), to be honest (L4D was a unique case at the time really, still would be today).
I'll leave my list as is, but I assure you folks I'd have a good 50+ titles to go on about.