Huge disappointment.
So in Ao2 you can choose between two characters, neither having any specific attributes. You play through missions carrying out Objectives and earning money by completing them. The story is OK but nothing to write home about, you start off in the Army, then get recruited into a Gun for hire corp. by your old Army boss. From their stuff goes wrong and so the story unfolds.
Now the single player was not all that bad, though for being on medium difficulty I found it to be a little challenging. Not that a good challenge is bad thing but it'll soon lead to frustration and broken a broken controller(s). The whole aggro thing didn't quite work out so well. If you have your AI partner hold aggro for too long he gets stupid and just passes out, so you'll have to stop what you just started with flanking and revive him. And consider yourself dead when you are injured and are in the need of his care for he is prone to glitch on walls or other obstructions until he himself is shot down. Another issue with the aggro is when you get behind a heavy armored enemy, the enemy tends to move his fire to you when your partner is AT FULL AGGRO. There for defeating the purpose of aggro.
Another thing that got on my nerves was the multiplayer. There is no deathmatch, team deathmatch that we've come to love. Bascially you're running around taking out Objectives and or targets for money...money mind you that does not stack and follow through to the next round... you earn money and can only spend that money within the round and if you find a weapon cache which is pretty pointless seeing as the rounds do no last long and there is no real point in trying it out to say you did and how much it blew... so you can only use the stuff you bought in the round where everything resets next round.
If anything this is a OK game for playing with a friend but not for the short tempered.