A lot of the remixes I used to enjoy lost their wow factor after I realized that they were just a novelty. I would wager that a small minority of the songs in OCR are actually of a high enough quality (innovation, sound quality, depth of composition, etc.) to have a lasting appeal.
The reason you think that it was somehow different in the past is because there was a period of 3-4 years when perhaps 1 or 2 songs a month would have such a lasting quality, and they accumulated. The quality hasn't really suffered.
I can't say that I don't agree with the TC in the respect that I really am not that interested in the new mixes, but that is my preference not the weakness of the mixers.
Edit: I've gotta say, however, that the sound quality of the new Chrono mix is crap. They should've been forced to retake or NO'd.
Edit: Also, a lot of the obvious logical inspirations for making a mix have already been taken. Honestly, whoever decides to make a metal remix of Clockwork from CV is gonna get beat on by Goat's "Trevor's Reflection". The "I came before you principal" applies here. Especially if a good job is done the first time.