Animovie Ratchet is not alone. I understand his point of view, because I too am not a huge Sargasso fan. But I think it has a lot to do with the type of planet it is (a farming planet) and the colour scheme.
Although I accept that dinosaur platforms were cool, and the level layout was pretty nice, with a few surprises here and there. But I just am not a huge fan of grinding levels, seeing as how I always play levels to 100% on the first visit (you'd think arenas would catch this sort of playstyle up, but really, they don't). I don't know, I'm starting to think the positives outweigh the negatives, but really I haven't been able to find all that many planets in ToD with negative points anyway (Fastoon don't count).
What's all this stuff about Zordoom and Reepor looking bad? I loved the colour schemes for those planets. How often do we get genuinely dark planets? That would be a cool thing for the Gemlick Moon Base's remake!
And on the subject of Torren IV. You all make very valid points, but I just loved the visuals of that level so much! Although I was admitably extremely underwhelmed by the amount of enemies, and weak platforming in the level, so it is definitely the second worst planet in ACiT to me. I just really don't like Vapedia… which is strange because it did have the best hoverbooting/puzzles in the game. I guess it just felt like it should have been earlier in the game for its overall looks.