Yeah, I agree. However, the first battle in and around the colony is really impressive, probably the best in show so far. I especially liked how Adou and Yuuma got so much into it that they resembled some old enemies of many clashes from a real Gundam show. Enemies for life but also with deep respect for the other's skills. Sekai himself is kind of an empty vessel who simply enjoys any matches and the developing himself. Fumino still feels like a support character for those two, and kind of really stereotypically soft and feminine, but that's okay. Shia is more interesting, though, with her mysterious atmosphere and how she so carefreely and willingly approach and helped Sekai. That's like the highest degree of dedication to the game, by making your opponent stronger so that you can enjoy the game more yourself. It could feel cheap and unrealistic, but it didn't for her, at least not in my opinion, but maybe that's because I thought she could rival Fumina as a love interest...
Looks like the three tea cups may remain the only sign of the cameos I was looking forward to for the duration of the whole show. The last ep seems to be sort of Yuuma's own mini arc. Although if that tournament is less structured (free participation without multiple preliminary rounds, or perhaps free tickets in), then who knows. It could be amusing if the old gang appeared there, but I wouldn't bet anything on it anymore. It's just a single episode anyway, so there's only so much it can contain.