The AWP will always be a weapon of controversy and discussion. People will always fight for and fight against it. While this is a pub the way I look at it is this: until CAL/CPL bans it then it should stay. Restricted to one or two per team is fine, typically you don’t have more than 1-2 on a team with an AWP anyways.
Anything with a scope will typically and generally be easier to use than something without. The AWP generally gets the most feedback and criticism because it can kill in one hit. The problems as Killty stated are above, but on top of this you also have to factor in that while a “good” AWPer can take out a good portion of the team the AWPer still has to work with the team, otherwise he/she is bound to get flanked sooner or later and thus killed. Moving with the AWP is where most get problems because you have to be ABSOLUTELY still to shoot the AWP and hit the mark where you’re aiming, otherwise you’re likely to hit Kansas than your target. The weapon has its major drawbacks but also has its perks, much like every weapon in CS. As I’ve stated before, people will learn how to avoid and take on an AWP head on. As far as I can tell, those who have started to play a lot more and play against the AWP, they’re learning and have been able to 
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1-2 per team like gxti said, sounds good to me.