I too have a 2012 179QB and overall it is a great RV. Small issues like you mentioned. Had to upgrade the cabinet mounting screws to longer ones so the doors would stop falling off, same with the microwave. It was hanging half out on our first trip down a bumpy gravel road.
Biggest complaint me and the misses have is the bathroom size. Toilet is super close to the shower and vanity. Makes it a tight squeeze to maneuver toilet paper in the right area if you get my meaning
All they had to do was get rid of the tiny table by the bed and extend the wall of the bathroom right upto the bed and you would have the 6" that are so badly needed.
Our goal is to use it enough this season to justify getting a bit larger unit next year. Maybe a toy hauler..........