I think they are right about you getting the role definitions wrong (I don't like the new roles system though. It just anoys me although I do understand why it was done but this isn't the place for this)
As for your class though it sounds to me like a ranger with more armor witch would be a...
Anyone thought up an artificer class for 4th edition yet ? I didnt get to play around with my 3.5 artificer enough to actually create a good conversion so Im asking you guys if anyone has had any ideas for it . I assume that there will be an Ebberon book released for 4th edition but I need this...