A couple of comments, from a 2014 Tuscany owner:
Too many of the comments here are blanket slams at Thor products (kind of like hating on a Cadillac because your old Vega was cheaply made). Thor is the largest manufacturer in the RV industry, and builds in every segment. No comment on anything but a recent Tuscany is really relevant to the OP.
The Venetian is not the current "top of the line" Thor product. In order, from the top, Thor diesel pushers are:
Tuscany
Venetian
Tuscany XTE
Palazzo
We now have over 30k miles on our 2014, and are still happy with it. We bought it because we felt it had the best features and floor plan in our price range, and nothing since has changed our opinion. It had a few initial problems, which Thor fixed under warranty, and anything since has been what I'd consider normal wear and tear. We have two Schwintek slides (the smaller ones), and one full-wall hydraulic slide, and have had no problems with any of them.