These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Tenchi In Tokyo
Broken Base: Fan reaction towards this series is mixed.
Alas, Poor Scrappy: For some. Whether you liked her or not, it can't be disagreed that having Yugi give her a Break Them by Talking right before re-absorbing her by force (and when the poor kid is crying and begging Tenchi to help her!) was really cruel.
Growing the Beard: The second half of the series, which actually features Tenchi growing a spine and telling the girls to leave him the hell alone.
Recycled Script: The way the script ends, it could be called "An extended version of the Tsunami/Sasami" episode in the original series With Yugi instead of Sasami one day becoming a romantic rival as well
Relationship Sue: Subverted with Sakuya. She's the shadow of the Big Bad, and is just there to try to trap Tenchi. This means, she's a Relationship Sue and has to stay that way so the story works.
They Wasted a Perfectly Good Plot: The series has elements of Romantic Comedy and Monster of the Week, which led to a very forced-in plot, which would've been better either that the show tried to be more realistic and focus more on the relationships off Tenchi and his harem and have Sakuya being a normal girl instead of the villain's conjured shadow made to keep Tenchi away from them and go into the depths of their feelings about the whole matter and led to a sound resolution; or focus on fighting spirits and limit the romantic themes significantly in order to present a very action packed story. Instead the story ends with another romantic rival for Tenchi with the very same reactions from the girls of Yugi growing up and becoming a threat to their confession of love and Tenchi returning to the chaos of the screwed up family in the Masaki shrine.
Alternatively, it could've shown how Tenchi would been as a normal student instead of an insanely powerful hero.