I've been playing this game since 2013. Over the years, it has changed a lot, but most of all I remember the addition of CZ-75 Auto, fix tec-9 and fix AWP. Many tournaments were played, I visited a lot of them, and I can say that I have never seen such an atmosphere in the hall, arenas, stadiums. This is one of the best games of our time. P.S. I constantly sell accounts and because of this, my full statistics can not be found, but believe me, you can trust me, I'm really experienced in this game :D
1. Over the past few years, the community of the game has changed a lot, I think it has become much more toxic, before the guys came across friendly, which was just a buzz to play this game. I was in America and I can say that, although the level of play in NA is a little lower than in Europe, but there are very friendly, responsive and sociable guys. And in Europe, on the contrary, I do not know what it is connected with, but the EU community should strive for the same result as in NA. In General, it would be cool if that atmosphere from 2013-2014 returned to our time.
2. In 2013 there were skins in the game, of course they decorated the game, there were new emotions from the opening of cases, sites dedicated to skins, etc. Some people ask me what skins I like, I answer them that I like skins from older cases and collections(~2013-2014 and early 2015). Developed a new economic system on the trading floor Steam, it's really cool. Now a lot of skins for every taste and color. And the main thing is that they do not give any advantage in the game. In this respect the Valve.
3. Much has changed FPS from previous years, now it is lower, I am far from the whole theme of development, how it works and do not understand why the FPS there sank, if in 2014 the game changed was 400-450 FPS, now 150-200, it is not very pleasing to me. Perhaps this is due to the large number of changes in the game, such as: adding skins, changing hitboxes, game mechanics and much more. Not a pleasant situation..

There are many more topics that can be discussed here, but I do not want to delay my review, in general, I like the game and this is my personal opinion