Yes sounds normal, the thing you have to remember is its a water jet powered boat which has different handling dynamics than a normal boat with a prop etc, so you have to helm it differently. Putting it in very simple terms the direction of the jet will make it turn but if going slow or moderate it wont turn as a normal prop boat will, you kind of need the thrust for the turn, yes it will slide and if going at speed and then dropping the power and trying to turn then it wont turn very well at all, many have had collisions on water jet type of craft.
My advice would be read up on how to operate a water jet craft and then perhaps get some lessons or go somewhere where no one else is around and practice, practice, practice, it will take some time to get used to it.
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