Eh, to me Fallout New Vegas would be worth the money. Really loved Fallout 3 and everything about it, glad no too much was changed and they kept the winning formula with a few minor additons and tweaks.
General consensus from most reviews is that the game itself is excellent, only technical issues hamper the experience, moreso than Fallout 3. Although if you could put up with the bugs in F3 I imagine it won't be too much of an issue. On the other hand, if you found the bugs too distracting, it may be wise to wait for future patches.