Ouch, sounds like 4ed D&D is a mass of problems, glad we stuck with AD&D (no significant errata in the main books, infact, the TSR products of that era were almost without glitch)!
I note that the "real and original" DMG, PH and MM have just been reprinted, to raise money for a statue to Gygax. Perhaps an opportunity to displace later editions of D&D?
Actually, you are quite right in so far that I have little to compare the proof reading etc in MgT to. I have bought very little rpg wise for years (some Cthulhu, 4th ed Pendragon (and that must have be 10 years old) and some of its supplements), tending to stick with AD&D, some 3rd ed (Games Workshop) RQ and various homebrew games until a chance discovery in the FNGS ignited an interest in MgT Trav. And as I now have copies of most MgT books perhaps I am over aware of problems with with Trav stuff, and ignorant of problems in the products of other companies.
You asked for opinions on the numbers of errors in the Solomani Rim book, I said that it was, basically, fine, and pointed out that the quality of writing, proof reading and editing in the MgT books is uneven.
Edit. On reflection, should gamers accept a lower quality of finished product from rpg firms than we would from other publishers? Does the defence that "other firms are much worse" reflect poorly on the industry as a whole?