Something important to note is that while yes, you can get to MP5 in no time at all, you do that because of players that have already spent months - or even years - to get there.
Newer players will always get further at a faster rate because they have the groundwork done by the previous players. It this same principle by which humans have been able to develop so much.
"If I have seen further it is only by standing on the shoulders of giants" - Isaac Newton