Amazon currently has a deal running for $5, for the entire game, and includes the first month of gametime. If you have a friend that's interested in playing as well, this would be a perfect opportunity for the Recruit-a-friend bonus, that'll grant both of you 300% increased xp as long as you're leveling together.
If you're interested in playing for story, both factions have some interesting lore; if you're interested in PvP, this might not be the best game to play at the moment (a lot of faction imbalance, and the more competitive levels are filled with botters, which is frustrating); if you're interested in finding the biggest, baddest dragon to slay, raiding at high levels might interest you; if you're interested in exploring the world, the game is big enough that you can always find somewhere new to go, and Draenor has a good number of treasures to find; if you like collecting things, there are pets, mounts, and achievements a-plenty.
I like the game, and I usually find a reason to log in and play; I highly recommend finding someone else to play with, that you know in person (perhaps your significant other, if you have one)... This game has something to appeal to almost anyone.