While many people decry spray tans because they look weird or they're uneven, they are much better than the alternative. Tanning beds give you that even bronze glow, but they also cause skin cancer and premature aging, which are way more disgusting than a weird orange tan. Also, spray tans are way better than they used to be, making them a better option.
While the tans produced by spray tans don't particularly look natural, spray tans don't use dangerous UV rays. Nothing that can cause serious health problems should be worth it just to possibly improve one's appearance, although personally I find excessive tans to be very unattractive. Don't jeapordize your health either way.