This is a discussion for the Counter-Strike: Global Offensive devs.
The search system is incorrect: it's based not on skill but only on rank, and sometimes doesn't work nether on rank search.

There's some screenshots that help you to understand what I am saying:
Example1: http://i.imgur.com/FOEaiMI.jpg?1
Example2: http://i.imgur.com/HnFmRb9.jpg?1
Example3: http://i.imgur.com/ofT0Wib.jpg?1
(if any readers have had the same problem, please post the screenshots which contains the problem.)

Many times my friends and me have been in games where the enemies were had a much higher grade of our, and other times we have met teammates who doesn't know how to play and simply the team was unbalanced... In my opinion the matchmaking system needs to be much focused on games won in the recent past time, skill in the recent past time and grade.
This discussion for us would be much, and I would be a better player if the team in where I am could be better. Please pay attention to this discussion...
Thank you.