I played it till rank 33 and since you get all the weapons like at 20-25 this game gets like super boring
Don't get me wrong this game is great but what's the point of playing it when there are no achievements or stuff you can unlock after you are half way through the game.
It's like that in Battlefield 2 as well but BF2 had also one nice ADDON called "Special Forces" (yea you read that right it was an addon not a shitty DLC
lol) and two overpriced DLCs with like 3 maps and 2 vehicles in each but all that was enough to keep me coming back for years.
To conclude Dice should bring some new gameplay mechanics to the table to keep me coming back which I hope they do with the Onslaught DLC.