This game just keeps getting better and better. One of the best value AAA games of all time, each level has a ludicrous amount of content to work through and nearly all of it is fun. It's difficult to think of many games with more replayability than this trilogy. The level design is perfect, IO have absolutely nailed the balance between sandbox environments and individual levels, packing each area with astounding attention to detail and countless opportunities. The main reason I keep coming back is the variance - each level has so many different ways to approach it, and that's not even accounting for the player made contracts and escalation bonus missions. I love that these games don't take themselves too seriously either, there's a ton of comic potential in every assassination you set out to do. The new Freelancer mode has cemented this as at least a top 10 game of all time for me if it wasn't already, adding a rogue-like element means I won't be putting this down for a long, long time. Can't wait for their Bond game.