I just wanted to put this out there. I'm a casual watcher of TAS videos from this site, and I ABSOLUTELY loved this run. I'm also a very detail-attentive gamer myself, and have made many of the fastest Worms Armageddon tool-assisted mission speedruns (check Other Games forum).
This run's goals are the most obvious goals for Tetris DS. The entertainment for me comes from being a player who has been practicing Tetris DS for months now, and having been able to beat it in under 10 minutes only a couple times (unassisted on a real DS, of course). With this run, I got to see some really interesting strategies (like how to fix holes at the bottom by utilizing floating tetrises etc.) that I personally hadn't thought of and have a hard time planning out while I'm trying to beat the game quickly.
To me, the other modes in Tetris DS are awkward and uninteresting, not to mention very difficult to play on a normal DS, where the screens are ~2cm apart. This mode is straight-forward and classic with a twist. I voted YES immediately after watching this run a few times (sometimes in frame-by-frame in my video player) because of the above.
In my opinion, it would be absolutely absurd to deny as straight-forward and obvious a run as this. If Baxter thinks he can do better on these goals with a day's work, I challenge him to beat this run! That's what this site is all about, right? Tool-assisted competition, and what better way to compete than this mode? This mode demonstrates all the classic precision-TASing of yesteryear, where we made very precise changes to save frames here and there, like avoiding using the "hold" can save frames (very precise random-manipulating instead?), rotating off objects to move farther can save frames at max level, etc.
Honestly, the only thing I would change about this run's goals is require it to be played on level 20 difficulty, which requires saved data. I know that's against the rules, but that would be most entertaining to me. This run as it is should be published to show the world how fast this mode can be beaten, and to put others to the challenge, because this is hands-down the most popular mode to play in Tetris DS, period.
Would-be-double-post edit:
I have another point to make. This is no average Tetris TAS where the author didn't take the care to make every line cleared a Tetris, like the bad TAS casuals seem to think is so great here:
http://www.youtube.com/watch?v=wLu428ppNa4. This is a TAS up to the standards of this site, where every line is part of a Tetris, and the author never made an obvious mistake. That's more than I can say for some of the more obscure published runs I've watched, where I see obvious mistakes where the author could have saved frames.