So from my experience

2 games a win and a lost almost has me at half level.

So it will probably take me 3 games to get to level 31 just by the looks of it.

I can agree the system is looking like it may take too long to get levels but if you play a smaller number of games each day and just stretch that out more evenly, you'll level up 10x faster overall I feel. The amount of exp probably needs to be evened out more so for people that play tons of games overall.