I played a Mark VII tenor for 10 years.
I wouldn't say it sucked but there were a couple of things I didn't like about it.
It was unresponsive and stuffy compared to the SBA that I play now.
Having tried a couple of SBAs and owning a VII, I would have to agree the SBA is a more "free-blowing" horn. A MKVII can be somewhat unforgiving but if you play it right it can sing and sound very much like a mid or late VI.
Stormott77, with this out of the way, the very reason why I bought my VII (an early one) is because it has that "Selmer core" so I'd say the one you tried was either a dud or not properly setup. And I can't stress this enough. I had the opportunity to play the best horn I ever played (a SBA) before and after it was set up. Before, I could tell the ergos were really well laid out and the horn was much lighter than my VII and as a consequence a little more vibrating, but nothing compared to how my VII played : rich, laser beam dark tone. After the setup, I could have sold my VII and one of my kidneys for it.
At the end of the day, and considering market value and store prices, I'd take a VII over any Chinese or Taiwanese horn on the market. The ergos of a VII have nothing to envy to that of a Mauriat or Cannonball for example, and these don't have the beautiful Selmer midrange.
Next horn I'll buy will either be a SBA or early VI because I can justify spending more on a horn only if it's one of these, but to each his own. Some people don't understand how someone can spend $12,000 on a Neumann U47 when a $100 Chinese mic does the job "just fine"...