Weakest Players? .25/.50?

After playing a bunch of tournaments and playing some .50/1 I decided to try some .25/.50 NL on PokerStars. My results have been really poor thus far, after beating the .10/.25 game and the .50/1 NL when I played that occasionally on a different site.

A few times now I've pushed with straights on the turn only to be called by four of the same suit and got nailed by a flush card on the river to lose a 60+ dollar pot.

Should I try to avoid these type of games with now a $600 dollar bankroll?

I've raised to 3 dollars preflop only to have all five players call me.

This may sound like a complaint post, and it could be interpreted that way, but I'm really honest.

Do you see this level as the ultra amateur level? When I was building my bankroll at .10/.25 NL the people seemed to play tighter.

Is the .25/.50 NL blinds where the maniancs that have to see every flop live and the .10/25 NL where the weak-tight players play?

There seems to be a better quality of players at .50/1 NL by a wide margin, to me anyway.

Correct?