Alright here we fuckin I hope I can count to fuckin' ten dude. 
10. Army of 2: Whatever the fuck 
So you guys might notice that I don't actually play a lot of story games in my list. That's because I've always became incredibly bored with every story game ever. Except for the 2 on my list. Army of 2 drew me in because it was literally just me and my best friend slamming ourselves head first into the characters. Anyways, fun partner fight interactions, love having battle where you need to pair up and break apart a lot of times in the same encounter. Good story, slammed through the games in a weekend. We still joke about playing it again sometimes. tenouttaten

9. World of Warcraft -
Fuck this game in every god damn way. Every time I touch it I become addicted. Even if it's just me sitting in goldshire watching the conversations happen. Still good to this day. 

8 Trine 2 -
As I said, not very drawn into a lot of story games. Double time for puzzle games. I fucking hate puzzle games. This game is read in the style of an easy to digest childrens story. Combine that with a snarky chick, an oblivious knight, and a slick as fuck failure of a wizard? All sharing the same soul? Sold so hard. Absolutely gorgeous game as well. Two good buddies and I might have spent 20 minutes sitting in front a background furiously fapping. 

7 League of Legends -
Oh LOL how I loved you. Probably the only game I ever thought I was one of the top people in a server. I just got incredibly good during season 2. It also got me into the idea of e-sports and playing a game as a career. I think I also learned how to teach people how to do things while I was pulling my 5 stack out of the trenches. Now I don't play this game. Season 3 was dull as shit to me, and my other friends started going "nah". However there is one last person playing, who owes a lot of his skill to me. I think he's still hovering at diamond 1. Really cool shit. 

6. Terraria -
Buy.
The. 
Soundtrack. 
This was the only game other than my #2 slot that could pull me off of League of Legends when I was into it. Great metroidvania style of game. Excellent item progression system. Nice 2D world building. The only flaw with it was probably how it can't push past it's 2D limits. Once you can beat all the fantastic bosses, and can get all the cool items you could want it's not really worth playing anymore. However it's still a game I'll restart every once in a while. And I drop at least a quarter of a year on any major patches. Good all the way through. 
Buy
the 
soundtrack
seriously 
[youtube]hYvppnyi5uk[/youtube] Check it. 

5. Diablo 3: Reaper of Souls 
Wow I can't believe this is the ARPG that makes it out of all of them. I don't know if I put this here because I've wasted so much time on my characters or just cause I'm impressed by the sheer magnitude of that shithole blizz dug themselves out of. A 180 of the century that's to be sure. Fast game, easy to get into for short bursts. But when you get into the complexities it opens up to a massively complex ARPG that with smoothness that every ARPG player has always wanted. (If this game made babies with POE I might die in a week.)

4. Unreal Tournament 2k4
Oh yeah. Arena Shooters. Fuck me right guys? Anyways 
None of you can beat my UT jumping fuck you. I'll lead you all like chickens to a slaughter. 
Now if only I had a new age tribes game =\

3. Starcraft 1.5: Broodwar
I think I might be a fan of a certain company. What can you say about starcraft? It jump started e-sports. It crushed all other RTSs out there. To the point where Blizzard owns the RTS genre. It's also a perfect example of why you let your player base muck around with your balance over long periods of time. (Seriously stop fucking with things, Riot). We got to see how strats changed without any balancing work done. (well.... almost) 

2 Borderlands 1 
Such a great game. Okay I'm first gonna tell you guys how many times my best friend and I played that game all the way through. The answer is 7 times. 7 Fucking times we played that game. And that's only on the PS3. I bet I've played that games 10 times to completion. This game is exactly what I wanted out of a RPGFPS. Great gun play, the devs sacrificed headshots for better fights. Looting was great. And Lilith is incredibly fun to play. All the characters have several different ways to be played. You can dump weeks and weeks and weeks into that game. Also, the humor was delivered perfectly. Not too in your face, but just noticeable enough to crack you over the head with a joke. I think I might just go play a bit. 

1. Warcraft 3: The Frozen Throne - 6 years. 
6 years blizzard. 
I want those back please. 
I could probably write a book on why this game is so good. 
But I won't because other people are more eloquent than me in this thread. 
Needless to say, this is the reason my top ten is so recent. Because fuck other games I literally have a modding scene that makes better games than most triple As. You can't get bored with it. It's impossible. 
It even made a genre. 
But not after the correct game. I want my angel arena esque MOBA. Come on that would be fantastic. Limited item components, bosses. What's not to love? Although there would be a lot of balancing needed to bring it modern. (Like no 1v1s every 5 minutes >.>) W/e