i was a big online player, and in two months i went from level 2, to level 16, just playing a game here or there in the evening and weekends, your avg opp level will rise if you play top dudes alot, i had to play level 12's or higher for several weeks to get it to start rising
to be real honest though, MRL and leagues have replaced online ranked games for me....
a big difference in the all-pro setting and all madden setting....
iam thankful for the online ranked games because i saw so many tactics, and it sharpens your skill to adjust on the fly and manage the game....
but i have found more consistent competition in MRL and other leagues, without stuff like A-gap manual turbo blitzing being done everyplay on all-pro setting....