Cleveland's RTA is a pretty decent overall public transportation system that should surely be used more than it is.
I am quite the fan of public transit systems and am glad that Cleveland has a number of options form busses to BRT to rail. The system is often compared nationally with the Denver RTD, which I can certainly see having lived in Denver for a number of years.
The Healthline BRT is often cited as a model for the effectiveness of urban BRT systems instead of or in addition to much more expensive fixed rail systems. It does tend to get a little crowded, and there is definitely a problem with almost nobody actually paying the fare which is on the honor system for the most part. Also, I wish the dedicated lanes extended through university circle and all the way to East Cleveland.
The red line to the Airport and back is very convenient and the seats are comfortable. the trains tend to be quite empty much of the time which is unfortunate. Also, some of the stops feel like they are in the middle of nowhere.
The bus system is pretty typical... the busses as far as I can tell run pretty much on time. Nothing overly special but not bad.
I haven't really seen anything overly crazy or unsafe... the worst that I have seen are freeloaders. Otherwise I would have no problem using RTA, though it is not very convenient to where I go on most days. It is great for going from the East side to downtown.