Once you go WOW, you never go back?
This is the case for me. Although I still find RS interesting, I'm no longer an active player, as an awful lot of my time goes in WoW.
I see some comments on WoW being a grind. Well, sure, every MMO is in a way. But RuneScape as far worse as far as grinding goes.
I wouldn't say it's easier, either. Boss monsters in WoW are vastly more complicated than anything on RS. The only thing that really stand out in Scape is the fight caves, although that's more or less due to the amount of time required for each shot you get to take at Jad.
I also saw someone comment he played on a private server. Seriously, don't. Both the community (which is like half the game) and the gameplay itself seriously fail on private servers.
The lack of solo-endgame comments are a valid complaint. Sure, there's some factions you can improve your standing with, but that's that, and even those have aspects of grouping to them. There's no devilishly complicated stuff like Mourning's End Two you can lose yourself in. So if grouping and socializing isn't your cup of tea, then WoW probably isn't for you.
I do disagree with RS being more "accesible" than WoW. Doing some stuff on the GE for five minutes is compared to doing an instance in WoW. A more reasonable comparison would be killing bosses in the God Wars dungeon versus doing an instance. And face it, you don't log in to do some boss killing for five minutes.
And finally, sure, you need a fairly recent PC to run WoW flawlessly on it's highest settings. But my old PC, which is at this time about six years old, was able to run it at an acceptable level with most settings at a medium level. Most of the requirements to run the game at an acceptable level aren't high at all - only it's RAM requirements might be considered high, as it isn't really playable with under 512 megs.