Toribash: Fun at first, but it starts to get boring when there are just a ton of noobs who don't know how to play.
WoW: really big MEH. It's click based, so you click on an enemy and then you sit back... BORING.
Runescape: Updated frequently, fun to play the first few days. Updated very frequently. But again, click-based, and even more so than WoW. Also, insanely over-priced.
Rubber Ninjas: Found it quite comical. Got boring after a couple of days though.
Savage 2: Amazingly great concept, but everything else failed. The owners never updated, the player base is so small, and new players that try to join are discouraged because the gameplay is quite hard.
Team Fortress 2: PReeety good game. But like Savage 2, gameplay is quite hard at first. Great concept. I don't like the maps though, and they don't have very many game versions (like Capture the flag, etc) I would have liked to at least have seen a "slayer" type thing where you go solo against everyone else, or a "team slayer".
Spiral Knights(First impression): I feel like this is a pretty good game, but I'd like to be able to solo. This game is nearly impossible to play alone. Sometimes even a team of two isn't good enough. Even more so if your party just plain SUCKS. This game also has an "energy system." This is where the developers earn their money. To explore deep into the city, you need "energy". Each elevator deeper is about 10-15 Energy so far. This is fair, as you start out with 100 energy every 24 hours, so you can get in an hour or two of gameplay each day. But, you also get quite a bit of gold in that hour, when traveling with a small party, so you can buy more energy with the in-game money you earned. If you haven't earned enough money for more energy though, you have to resort to begging people for money, stopping for a day, or paying with money in real life. This bugs me a bit, when I want to get in some solid gameplay for more than an hour or so.