widowspeak wrote...
I cannot speak from experience about Fallout 3, though my friends and coworkers seem to think very highly of it and all it's DLC.
As to DA:O, the game isn't perfect, but it is quite enjoyable, to say the least. Remember the big, "You have GOT to be kidding me?!?" moments from ME1?
Yeah, Dragon Age has a few of those. Those are what make it all worthwhile for me.
Gameplay-wise, it depends on what platform you play it on. If you play the PC version, playing a mage SUCKS. On any difficulty other than 'casual', area-of-effect spells cause friendly fire damage, making combat very frustrating as a magic-user. If you play it on the 360 or PS3, its a bit better, as friendly fire damage from AOE spells only applies if you play above 'normal.'
In terms of bang for your buck, I spent nearly 50 hours on my first playthrough of DA:O and that's not including the new Awakening expansion pack.
HTH with your decision, and happy playing when you get to it. 
Playing as a Mage sucks? The Mage is by far the most powerful class in the game.
I've soloed a Mage (Blood Mage / Arcane Warrior), Warrior and Thief on Nightmare and the Mage was a cakewalk. Yes AoE spells also damage your allies but that's why you shouldn't use them on your teammates. AoE spells are incredibly useful (Virulent Walking Bomb! Storm of the Century!), especially in buildings.
Fallout 3 is fun. It's a sandbox game with a lot of possibilities, but the game isn't perfect. Things I don't like about Fallout 3:
- The story
- Some of the DLC's (Point Lookout is awesome, Mothership Zeta is an immersion breaker for me, Operation Anchorage is quite short and Broken Steel turns the whole game into an unbalanced mess and has no story).
- The graphics. I admit that the setting is quite nice but if you compare the NPC's and textures with Dragon Age Origins, or even Mass Effect 1, you'll see that Bioware>Bethesda on visuals/animations.
- Companions? Romances?
- More weapons please! Only one sniper rifle? No weapon attachments?
- No respawning enemies so after a few hours the Wasteland feels empty.
- Combat. I prefer the combat in ME1, Dragon Age and ME2. V.A.T.S. is over-rated imo and makes the game too easy. First-person combat needs iron sights and more action. Even the combat in Oblivion was better.
- Too easy. Where's the hardcore mode where you need to drink water, eat food, sleep every day and treat your injuries? I was expecting a horror survival game, not an arcade RPG/shooter.
Some of these problems are fixed by mods but I still prefer ME1/ME2/DragonAge.