First of all, New Vegas is a masterpiece. Alas, i strongly feel that some minor, yet essential, things could be missing.
About Casinos:
-Except poker not being implemented, i don't feel they are glamorous/crowded/noisy enough to offer the feeling and atmosphere of a real casino. I realise this is a post apocalyptic wasteland but New Vegas should live up to its name. Gamblers cursing, yelling, crying, some going berserk and some even drawing their guns would make a huge difference and upgrade to the immersion. Again, what's up with the empty and quiet casinos? With all the respect, they more like remind me of my grandma's cottage.
-Except poker not being implemented, slot machines being more profitable than roulette? Being able to place the same bets on slot machines and roulette is a no no. Slot machines are for small fries.
-Except poker not being implemented, think what difference would it make to raise the 60 seconds of "cheating prevention" or "shuffling cards" when loading a game to, let's say, 10 minutes. I confess that when i needed money i resorted to the easy slot machine save/load thing and got like 100k caps within minutes. I don't have to tell you that this ruins the economy of the game and the whole scavenging/questing to earn money process that makes fallout what it is.
I could write an essay about casinos but i'am too tired and i will probably tire you too. I guess i can only hope that this post and its points will not have been written totally in vain.