I completely agree. ;) It's kind of the reason I didn't post it 2 months ago when it first came out - just a new (uninspired IMHO) version of Utanaki Oka e from Ciel nosurge (which I actually liked), which in turn wasn't that different from the Ar tonelico opening, Utau Oka.
Considering Utau Oka itself had 6 arranges over the years (3 opening versions, each with a different long arrange) at this point I'm treating the new openings with just nostalgia values rather than "new song" excitement.
I guess they are not really Shikata songs per se. All of them are composed and arranged by Akira Tsuchiya (I don't know his work outside Ar tonelico/surge concerto but maybe he's a 1 trick/melody/ pony?), with Shikata only doing chorus arrangements.
I really wish Genometric Concert Side.Sora previewed one of her actual in-game songs but it only had the OP. I did enjoy Origa's song so I'm looking forward to more from Side.Blue.