Actually Miller, NV already have more bug fixing patch then FO3 at this point, since there is two patches before Dead Money and the one with Dead Money; unlike FO3's patch with DLC only contain achievement......
With the exception of the Pit, I've seen less bugs in FO3 than FONV. I have at least two to three friends who also will admit they have very little issues with FO3.
NV is another story. I've had 2 character corruptions and one that resulted in the loss of my Very Hard run. I've had at least four to five mission glitches, and well over the allotted amount of re-saves. I keep running into hollow skin floating heads (also in FO3) a little more frequently, and Energy Weapons are still meager compared to several Solid ammunition firearms. Melee in both games is still too easy so I'm not going to bother bringing anything else about it.
I'm also noting at least one freeze per week or two, somewhat similar to FO3. Death Claw Promontory also used to crash on me, so before the last patch and DLC I had to clear my cache and play on Default settings. Which by the way, the Alien Blaster is amazing, which isn't the case anymore. The new patch made Most plasma weapons non-versatile, made the spread too wild with the slow velocity.
Just the things off the top of my head, I'm sure if I sat for an hour with friends we could come up with a longer list of complaints and issues.