I think this varies a lot between different sites, time of day, randomness etc.

My experience have been a bit awkward though. At micro stakes there were a lot of players who were pretty serious about their game and played a solid tight/somewhat aggressive game.

I am very convinced that you are more than good enough for 50NL and 100NL. Do not be afraid- most people suck even if it is 10 NL, 25 NL, 50 NL, 100 NL and even 200 NL.

From what I have seen, Pokerstars and Fulltilt consists of much better players than smaller sites.

50 NL and 100 NL is almost easier IMO, because you already know the ABC TAG game and can exploit it whilst there are still a lot of fish. I mean- I see people calling an all in bet with a backdoor gutshot.. In addition to that there is more reckless betting and its much easier to trap players, pots are usually bigger and people try to outplay you more.

The average poker player is...average- You are not. (Hell, you are FTR member for christ sake..)

Poker is poker- stakes does not matter, only the players you are up against..