I've played this game for almost 5800 Hours according to Steam, however many of those are AFK hours where i would leave the game running. I believe i have personally around 2500 or so Real In-Game Hours.

Pros:
It is a fairly easy game to learn, if you are willing to put the time into learning recoil/spray patterns, and communicate well with others.
There are a handful of people who will teach you the game.
Installation is quick.

Cons:
Competitive Scene is toxic, which I know I'm a part of.
Everyone thinks they are the AWPer (Sniper), and will get mad if you choose to do the same.
CS:GO Skins are addicting to purchase/Gamble, so either have self-control or realize that just because the game is now free, doesn't mean that you won't spend money on cosmetics.