I usually jump between bouts of reviewer criticism and childhood glee. Recent games that matched the latter include:
Portal, Portal 2
Team Fortress 2
The Walking Dead
XCOM: Enemy Unknown
If there's anything they all have in common, it is a strong, unwavering commitment to the world and story [XCOM being a possible exception, it's kind of eh in its world], with no concessions or asides. If a game can tell a story well in a creatively-developed world, I'm hooked to it. I imagine the reason I don't feel that for more games is because I'm already exposed to so many tropes and clichés that mire others. All of these game on the other hand, were either very original, or did things in a original way.