Personally, I like Eleen quite alot. I think the fact that she warms up to Gentaro right away reveals that she is actually a genuinely friendly person underneath, and it really seems like under a different circumstance, these two could've gotten into a relationship. Yes, I think she has a very harsh opinion of Yuuki, some of them aren't warranted, but I think she brought up some very valid points about her such as her tendency to become sophomoric and even juvenile in her behavior, and for a straight-lace like Eleen who treats the dream of becoming an astronaut seriously, I can see friction developed and it indeed happened in this episode. Plus, her criticisms of Yuuki echoed some of our own critique of Yuuki in this series, and I hope at the end of the arc, she'll actually learn a valuable lesson and not be so childish most of the time. Her treatment of Kengo with Aquarius' power and her disdain for Hayama further endear her character to me.
In other somewhat related note, I think Aquarius is an amazing Horoscope. Yes, offensively she may be weaker than other Horoscopes, particularly Leo, but the fact that she can heal any injury or damage, even from Limit Break, makes her one of the elite of the group. She also has a very intrinsic and beautiful design and imo the best looking Horoscope along with Cancer and Scorpion. It's too bad that, from the look of it, she'll probably end up the same as Aries and Capricorn, and disappear after the end of the two-parter. Eleen is a very pretty girl and I'd hate to see her leave, to be frank.
Btw, do you guys think that Yuuki really hid the camera? I found it hard to believe, because she doesn't seemed like the type who'd try to one-up someone like that, but Eleen has a legitimate reason to be pissed off at her and went berserk like that. I just wish she won't be so intense and would actually join KRC later on, and spare from a fate to Dark Nebula.