I have a 2014 3600 and have no had any major issues not even evidence of frame issues. Most of the items I did have to where taken care of during PDI and accepting the unit. Not sure how detailed of a walk through your dealer did, but it sounds like not much of one before you took posession.
But if you just got the unit 2 weeks ago, how did you miss some of this before you drove off the lot? I know its winter and cold, but I would not have take delivery without going over the entire unit.
That being said, my experience with the warentee work has been great. Nothing has been rejected on me, and I have not had to spend any of my own money on repairs. After a season of use I started to have some of the bottom slide wrapping show wear and the dealer did a great job adressing it for the long term.