Dishonored

One of the best games I've played on a long time, I thought Dishonored was a truly outstanding game.
While the plot was fairly predictable, the fantastic setting and outstanding voice acting made the whole game feel truly big-budget.
Similarly, the open-world approach to the missions and the imaginative range of special powers made for an atmospheric blend of tension and sudden violence that was great fun from start to finish.

One criticism that I've seen levelled at Dishonored is that it's too short. I find that a bit strange - maybe if you blitzed through it with crossbows blazing you could finish pretty quickly, but that would be missing the point.
I played with a mostly-stealth approach, but without going for the extreme pacifist achievements and I clocked around 24 hours over a week - collecting most items without being a completionist.
I guess I'm lucky that I can afford to buy new games fairly regularly - but I would much rather play a short, perfectly formed, game than something padded out just to make it longer (looking at you, Skyrim)
And 24 hours isn't exactly short.

So if you're worried about value for money, don't be. If you're not a fan of stealth games, neither am I - Dishonored is definitely worth playing (although it might be worth waiting for the next Steam sale as it was 50% off at Christmas...)