I've made posts about this in the past, and I will continue to do so. I love Fallout New Vegas, it has been, and still is my favorite game since it was released (And before that, Fallout 3). I see no flaws in this game, and all personal preferences can be fixed with mods.
I currently have roughly 2,000 hours worth of time put in this game, I've bought it 6 times, (twice for me, bought 4 copies for my friends). I've discovered and walked to every location in the Mojave, I've killed almost every killable NPC that I can think of, and I've likely done more than 3/4ths of the quests in this game (My number there could be way off). Also, I have tried every play style in every situation that I could come up with (Melee brute, sniper, good natured, explosives, ect.)
My reasoning for loving this game so much is the variety of perks, attributes, and skills that manipulate each other into molding the perfect character that suits your playstyle. The open world gameplay takes that even further, and makes you feel as if you are truly in the life of the courier that you have molded.
Long story short, in my opinion Fallout New Vegas is the greatest achievment in gaming even today coming up on 2015. I sincerely hope they make a Fallout 4, and hold it up to the same standards that they held to this one.
10/10 For Fallout NV