I do a lot of my poker in Freerolls. I'm on ACR 75% of the time, and clubWPT a fair amount, and I enjoy it.
Built myself a small roll too. In the past year, I've gone from literal zero, to $81.00 Not all from free roll, I've played the odd $1 and $2 tournament here and there.
For sure there is a different vibe depending which site you're on. ACR has 'normal' players mixed with maniacs. ClubWPT is filled to the brim with calling stations... it's hard to win anything there.