Ed,
You are a professional reviewer and of all people should be aware that one of the changes made in going from the Music Hall 2.1 to the 2.2 was the tone arm. The new arm has a one piece Headshell and arm formed from a larger diameter aluminum alloy tube also stainless/sapphire pivot bearings and rudimentary VTA adjustment capability. No it's not an SME but is not bad at all and certainly can accommodate and show the advantages of a moderately priced moving coil cartridge. In fact it works quite well with my Denon DL160 and my older Audio Technica AT30 HE. Jazzhowell already did the right thing by adding the speedbox and he can also add an acrylic platter as a further worthwhile upgrade without spending a lot of money. I also own a Linn LP12 that currently has a Sumiko Premier MMT arm, Hercules speed regulator board and a a Sony XL44s LOMC. Is it better? Yes, but it costs 6 times as much and has it's own set of issues with such problems as footfalls and isolation.
Oh, and the Music Hall platter is non ferrous and not a problem with strong magnets in a cartridge (the Philips GA 212/312 were the last turntables I can remember that had a problem with moving coils due to a steel platter).