I will take a crack at this....
Is there good riding in the area? It depends on where you are coming from. There are three or four rides I do regularly. Red Rock, Mt. Charleston, Lake Mead to Valley of Fire and through Parhump and around. Zion is only a couple of hours away too and that is a pretty good day trip. The lake loop can kill about 3 hours no problem. So to sum it up, there are a few good places but if you really want to ride, you have to get out of town. I almost forgot about Death Valley. That is a good one to and can be a solid day ride as well.
How's the weather for riding year round? There are only really 2 seasons in Vegas. Hot and cold. Spring and Fall last about 3-4 weeks each, although this year Fall has been a little long. Good for riding though!! I personally dont like to ride in the heat. Once it gets over 105 I park the bike. I still go out early in the morning for an hour or two but it is usually over 100 by the time I get home. Winters are mild with the high tempatures in the 50's over all. Nice weather for me.... So to answer your question, it is really easy to ride year round. Especially if you can stand the heat.
Are the cager's more or less crazier than normal? I would say they are on par with California dirvers. Mostly because we have had so many people from California move here over the past few years. Just like any other highly populated area, ride like you are invisible, pay attention and always have an out and you should make it home every day.
What's your opinion of the Las Vegas area in general? In general Vegas is an interesting town. The first time I moved here in 1990 there were about 650,000 people living here. Now we are over 2,000,000 by most conservative estimates. There are good parts and bad parts. The closer you get to the strip and downtown the older the buildings and neighborhoods are so the areas get a little rough. Parts of North Las Vegas are pretty bad. Look closely at Henderson, Green Valley and Summerlin. I personally live in the Summerlin area and have spent most of my time in Vegas on the west side of town. I just like it better.
Come for a visit some time and I would be happy to show you around. Ask more questions here or feel free to PM me if you want to know more.
Good luck on your decision!!!!