The combination of tower defense and hack-n-slash works fairly well together, though the classes are completely unbalanced. Melee is by far the easiest.

Orcs Must Die! 2 [Steam store page]
They added co-op, but lost some of the humor that made Orcs Must Die! so fun. Similar gameplay, with more expansive levels to challenge two players.

The art is bright and fun, but the narrator really makes this game fantastic - narrating every move as you shoot and smash your way through the story.

Defense Grid: The Awakening [Steam store page]
A carefully balanced tower defense game with excellent voice acting that weaves an interesting story throughout the campaign.

It looks nice and is enjoyable, but could use some tweaks especially at the more advanced levels. A bunch of enemies in a row can tag team your resources quickly down the line from quite a distance away - which feels a bit cheap at times, especially since the resources travel much faster when rubber-banding to an enemy unit.

It also would be nice to have more control over tower targeting priority, or even just a manual targeting mode. For example, in the later levels you want guns to tear the shields off targets before the lasers attack them - but the guns stay focused on a target until it is completely dead even if they aren't doing effective damage.

It's still one of the better TD games out there though, excellent polish and balance.

Far Cry 2: Fortune's Edition [Steam store page]
Much nicer looking than Far Cry, but it suffers from a tutorial that doesn't let you visit locations out of sequence. After this it is a bit too open and free. On par with BioShock game wise, but not in story.

Assassin's Creed 2 Deluxe Edition [Steam store page]
Disappointing compared to Assassin's Creed. The graphics are better, but the console-ified tutorial shows icons - not keys. Free running is also a bit harder as the buildings are sparser, and it is a little buggy - allowing you to slip and fall off rather than balancing on the edge.

Doing one mission at a time is annoying, but it is nice that quest timers stop once it is complete, rather than making you race back to the quest giver like the original game. Being able to block punches is also a great addition - sorely lacking in the previous version.

Overall an okay game, but it doesn't really live up to the free spirit of the original. Definitely feels like a game rather than an immersive experience.

Assassin's Creed: Director's Cut Edition [Steam store page]
Interesting story, good combat, most flaws in this game are minor - it's a lot of fun.

The only major problem - especially for replayability - are the multitude of unskippable cutscenes. It's incredibly annoying to sit through repeated speeches that are long enough to get a snack.

It opens with what looks like a hectic tutorial, button commands flashing on your screen - turns out it's just a dream intro (thank god!). As you get into the actual game the button combinations are complex, but they become more natural as you play.

The gameplay starts out a bit slow, with long distances to run for no apparent reason other than to familiarize you with the town geography. Thankfully they give you a horse fairly quickly, and teach you to sprint. Mercifully it also never seems to limit your sprinting or galloping abilities by making you 'tired' as some games would.

The game is also graphically nice, except when you have a close-up of the faces, then you hit uncanny valley territory. The only flaw is the unskippable pans/cutscenes in certain places that can be annoying if you die. In the end though, these flaws are tiny compared to all the good parts of this game - and I would highly recommend it.