I can see where if you speedlevel to 60 it might be boring, but honestly, I took my time leveling and am having a blast. There's so much to do, if I get bored questing I can grind mobs for wool/silk/leather, or go fishing to level my skill up.
Plus the rested XP bonus helps a ton if you don't play a lot. I went almost a week without playing and my rested XP bonus was so big I just keep extending it by completeing quests. I'll probably earn double XP all the way up to level 28 now (I'm at 26.5).
The only thing that would make me say it's NOT worth it is the server stability on some realms. All the realms went down for "scheduled maintence" last thursday, some of the more popular ones were down from 7pm EST to past midnight. Then they took a handfull of servers offline sometime saturday and they were offline until about 3am today.
They have been good about extending people's accounts for such downtime in the past. They said we'd get a day for the Thursday downtime, no idea if we'll get anything for the Sat-Sunday downtime, but I'm guessing we won't since the servers weren't continuosly down (ie: they'd come up but there'd be no mobs and it'd crash within minutes)
That's only really an issue for heavily populated servers though. Unfortunatly, if you play with a big guild (like I do), you're almost certainly on a heavily populated server.
Edit: Don't forget your first month is free and included in the cost of the game.