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.
Les Yay: Either that, or both Falis and Alita suffer from acute narcissism; maybe both.
So Okay, It's Average: The plot is completely predictable, the animation could be better, and some of the more interesting questions are never answered. On the other hand, it's only six episodes, so the general consensus is that it's worth watching anyway for the fight scenes.
The anime ending, when sadly, Dominikov, Pete, Ana, and Yuna must be killed in order to stop the lost technology from killing everyone on the planet. The fact that they (even Ana) smile as they Disappears into Light doesn't help.