I've used Runescape to insult players in other MMORPGs. I'd rather have a steady client installed on my system rather than play in a browser window. Better graphics and speed that way as well.
Who cares about the graphics?? Really Runescape's graphics aren't that bad. You can play it in high def full screen mode, which is really good for a browser. Also you can play from any computer. So Runescape owns all
I played until they got rid of the carpal-tunnel destroying game mechanics, after that, it just wasn't fun. I mean, really, games like this are click-happy games and once you take that away, you don't feel like you're doing anything.