Well, I have a 1973 Honda SL125 and I have some great fun on it.
I try and do everything I can on it. I've done a couple of enduros, I do trail riding on it, trial riding with my first competition coming up around christmas and its also my road bike.
I have had my fair share of problems with it, but probably as it is my first proper motorbike and its a learning curve
I've just a fairly major service/overhall on the engine so hopefully will be much better from here on in.
Besides, old bikes have character