My experience with public transport here is that it runs pretty well until about 8pm, depending on route. In the evening, buses run on a slower frequency and can be considerably off schedule. I waited almost an hour for the Airport Flyer into SoBe around 9pm, and was there at least 10 mins early. Route C is supposed to run every half hour, but while eating at a restaurant on Washington Friday night, I saw one go by at 8:28pm and the next at 8:35pm. Went to the stop 15 minutes later, and waited just short of an hour until a #120 came, which also went to the Omni station.
Of course, there's always taking a taxi as an option, but there's also that feeling that the bus must be coming any minute after waiting so long, and is 1/10 the price of a taxi. When going from SoBe to downtown, my recommendation is to take a bus when it's scheduled to run at least 3x per hour over to Bayside Marketplace. Then you can have dinner/drinks for an hour before taking the Metro Mover or taxi to the club. That's a more enjoyable hour than sitting at a stop on Washington Blvd. watching the bums go by. 
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