To be honest this is one of the best games ever. CS:GO Franchise is very popular, even my parents played this before.
Strictly referring to actual CS:GO game i have to say only 2 words '' It's awesome" but it also has its weaknesses and these are:
- Bad Anticheat (You have a big chance to meet hackers in your matches such as guys who see blue through the walls, people who count the bricks on the ground, etc.)
- Very toxic 9-12 y/o community, but if you don't give them attention it's ok.
- Ping problems on Eastern Countries.

I hope after all that rumors of "Source 2 in CS:GO" Valve will boost this game a lot.