First of all, New vegas is a lot like a very large downloadable content for Fallout 3 in that it uses basically the same engine and play is similar. That is a good thing for me. Fallout 3 was let down by quality control issues (program bugs) which caused frequent freezing an occasional slowdown of the action on the PS3 at least. Still, it was quirky, fun, and interesting. I liked the story, I liked having a “house” and being part of the world. I liked learning about the world of Fallout 3 prior to the war and afterward. I like the heroic aspect of helping the wasteland get back on its feet and being a force for good.
New Vegas had a few new and interesting aspects -- the crafting, the gunsmithing and modification of the weapons, and the idea of the factions. The trouble is that both in the content of the game and in its execution, it failed to achieve anything like its potential.
First, in the intervening time, the Fallout 3 bugs have not been fixed, indeed I found more freezes in my PS3 than in Fallout 3, and the periodic slowdowns were more severe. Additionally, I found numerous in game bugs involving doors that refuse to open even though they should (the door to the Strip for instance), quests that failed for no reason (monorail exploding even though the bomb was disarmed if you saw the NCR officer first), and followers who either attack your allies or just stop following you for no real reason. These bugs made the game more tedious for me than fun, having to concentrate on overcoming the bugs rather than playing the game.
Then there was the content of the game. There was little chance for heroics in the game because all the factions were pretty low on the good vs. evil scale. The NCR, Mr. House, and Yes Man are all willing to do pretty much anything to “win”. And whatever path you take you end up doing things inconsistent with being a hero. You can’t have a good base of operations either. There is the Topps and Lucky 38 casino, but they’re not really very accessible for returning to after missions, even if you’re allied with the right faction. The closest I found was the Novac hotel room which I found unsatisfying.
Furthermore, there is very little information about “the world” in and around New Vegas unless you ally yourself with Mr. House, and even then you only get a short story. All those little easter eggs in Fallout 3 about how the war happened and how the world worked prior to the war are missing in New Vegas. The quests are typically uninteresting and involve more factional politics than heroics or excitement. And to add insult to injury, completing the main quest once again ends the game.
Lastly the game guide purchased separately is, in my opinion, inferior to the Fallout 3 guide primarily because it lacks an index. It also lacks small maps of the regions in the region guide which are very useful orientation features.
Having played Fallout 3 three times and New Vegas once, I’m more inclined to play Fallout 3 again than I am to play New Vegas a second time. I'm glad they got another game out, but I think it's buggy and lacks the engaging story of the original.