lol i agree Numa, Guild wars has beautiful graphics. I hate cartoony graphics (one reason I'll never play WoW) and GW just looks gorgeous (admittedly i have it on full specs

)
I come from an rpg background (BG series, IWD series, NWN, Fable, Morrowind, Divine Divinity, UO etc etc etc) and I love this game. I'll be honest I was never interested in GW until I saw a screenshot of the bone dragon... I went and preordered it to get in a beta straight away
You'll find it far less involving compared to most MMOs (no houses, no armour crafting, you just buy it, no super weapons to find etc etc) but at the same time, its not like your typical one (e.g. in UO unless you're a necro or a dexxer, you can forget pvp), you can make your build for you, if you enjoy it and it works for you, great! You can change you build whenever you're in town, you get to mix and match professions (for example, right now I'm enjoying having a Mesmer/Necromancer who hexes and curses their enemies into submission

) or you can just stick to your main profession (as I do with my Ranger/Mesmer).
The story is long (though confusing) and it can get boring if you try to play through more than once, but the builds and enjoyment of beating enemies pull you through the boredom (i have 6 chars now lol). And the best of it is that its free. I got bored of it for about 2 months back in summer. I lost nothing. My account wasn't temporarily suspended, I didn't play £20 for something I wasn't playing in that time, and I didn't come back to find that everyone was twice my level.
Now I do have to say that its not gonna compare to Oblivion when that comes out BUT they are totally different games. So... its probably a choice of whether you get GW now and Oblivion when its out, or if you get Oblivion and then wait til after you got bored of that before buying GW. But I'd definately recommend this game. Once you get out of the typical rpg mindset of "must reach lvl 100 and get uber sword of uber slaying!" you'll realise how amazing this game is.