Watched a lot of robot anime last month.
Rewatched RahXephon. I'd tie it with NGE at 9/10. I especially liked the first two episodes. I thought the romance in it was quite good, too. The animation goes off-model from time to time, but it's serviceable. The music is wonderful, especially the closing theme https://www.youtube.com/watch?v=8aTUy44JA8w
I also watched Eureka Seven and found it vastly inferior to RahXephon - maybe 5/10 and that's pushing it.
I've been enjoying Knights of Sidonia [slight spoilers] - a half-and-half mix of neat science fiction and annoying fan service. There was an interesting romance in the first season (and one wonderful scene of a couple stranded in space) but it's pretty ridiculous how every female (including the eldritch monstrosity) loves the oblivious protagonist. Also, Izana has the potential to be super interesting but zer potential is mostly wasted.
As for the animation, I know it is controversial, but I think it's quite good. It's also obviously the future of the medium - people will get used to it. I'll give it 7/10.
Knights of Sidonia
I still enjoyed the setting and some of the fights but I thought the second season was a fair bit worse than the first due to (as you mention) too much focus on harem antics, combined with a reduction in the overall sense of urgency/plot momentum.
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