We just bought a Ranger 28 and had it out for our first cruise on Lake Superior this past weekend. Reverse is waaaay different on this than my past experience with primarily powerboats. However, it works ok once you get used to it. You need more throttle in reverse than you'd think, and the minute it starts to actually move in reverse in the direction intended, then back way off or even drop into neutral and let your momentum and the water moving over the rudder do the work.
It's never going to leap forward or backward like a powerboat...everything is going to happen much more slowly and gradually. Don't make abrupt moves, plan ahead, keep speed in the harbor at a minimum needed for steerage and plan a few moves ahead and you should be ok.