Some very good comments. I agree with Fred, the quality has gotten better as production has progressed. I have an MTH BR44 and really like it, plus a couple of E94s and some of the modern locos. The body work on these is very very nice.
However, there are some issues. The BR18, as Fred said, was neither scale model nor tinplate and started many people off on the wrong foot. I think one of the biggest issues is that you just can't exchange decoders as MTH has all of this built in. Most Europeans run Lenz or ESU or Zimo and want the ability to change out decoders.
Then there is the competition, either high end brass or Lenz, both of which are very very good. Bernd Lenz has done a great job of introducing, and marketing, high quality products and his company literally sits in the middle of his customer base in Giessen, Germany. If you have the chance, and I have had the chance to visit his company during the Giessen 0 scale days, it is well worth it. Great products, great service, and Bernd Lenz is a great showman.
Again, high end brass will always be what it is, and between brass items and Lenz products, this is a tough market.
Miketg