My children love going to Las Vegas and I see nothing wrong with taking them there for a family vacation. That being said, I keep my children away from the casino floor and bar areas whenever possible, and I strongly disagree with parents walking around Fremont St. At 11pm with their kids in strollers. There are drunk people everywhere not to mention scantily clad people all over the place. It is NO PLACE for kids. I think the reason my kids enjoy Las Vegas is because we don't make them stand around waiting in lobbies or in the hotel room while we gamble. We barely gamble when they are with us and rather choose to focus on the entertainment opportunities that the city has to offer. THERE IS A LOT TO DO IN VEGAS THAT DOES NOT INVOLVE GAMBLING. The last time we visited Vegas with our kids (we take one family trip every summer) we stayed at Circus Circus (don't stay there if you don't have kids) and visited the Adventuredome, the Las Vegas Museum of Natural History (AWESOME), the Clark County Museum, Ethel M Chocolate Factory, Silverton to check out the live mermaid show, the Pinball hall of fame and the Bellagio conservatory. We were so tired at the end of that day that we almost fell asleep at dinner (Rock N' Rita's). We are taking our summer trip in 2 weeks and are headed back to Circus Circus and will visit the Adventuredome, Planet Hollywood for "The Beatle Show", the Venetian for the Madame Tussaud's, back to Pinball Hall of Fame and to New York New York for the coaster and some sight seeing. I for one, cannot wait!
You can go to Vegas with kids, but please remember the trip should be about them having fun, not you. If you can't handle that then find them a babysitter!