Addicting games doesn't let you rate the games. You can post, but you can't rate. Also when you post, nutin happens. No points or rewards. I don't like that.
I actually know of a lot of different flash game sites, but ArmorGames is my favorite. It doesn't have as much quantity as most of the other sites, but the games are much better. AddictingGames has medium quality and high quantity. FreeOnlineGames has extreme quantity, but the quality's below average. ArcadeTown has fairly high quality, but you have to pay to play most of its games. Miniclip has pretty good quality and quantity.
Those are my favorites, those websites are usually enough to keep me occupied when I'm supposed to be doing homework.
I've mained on armor games ever since the downfall of Ugoplayer (back when their games were still organized and all). Back then Armorgames only sponsored shitty games, nowdays they got almost all the good ones. I check newgrounds every week or so, and I visit Kong like once in a blue moon as well.
Still wish Ugoplayer would go back to it's old format, they had a bunch of badass old school games, which are now hard to find.
