Turn A Gundam is a romantic, mythic story, with noble characters, beautiful music, and arguably the best mecha designs in the series, courtesy of Syd Mead. It’s deliberately paced and explores its characters, politics, and the human consequences of war as much as its mecha. The setting is an amazing meeting of 1900’s era technology, UC Gundam era, and far future tech; woven together in perhaps the most interesting possible way. So what you get is a celebration of early aircraft, the excitement of mankind’s first spaceflights, classic Gundam designs, and an optimistic vision of a future utopia, all in the same story, in a way that works. It’s amazing to me.
The protagonist is a gentle, intelligent boy, who pays attention to what’s going on around him and makes the best decisions he can. It has probably the best woman in Gundam in Dianna Soriel. It has the best Char-Like. The story is about the struggle for peace between Earth and space colonists; and its conclusions stand in contrast to the rest of Gundam in an optimistic way.
Complaints against it ITT seem juvenile, along the lines of “it was boring” “it was slow paced” “characters don’t act “rationally” like they’re in a WW2 style drama about axis vs allies” or “there’s not enough mecha action”.
If you are an adult, with some taste, and an interest in mecha anime, you will probably enjoy it. It’s one of the best anime I have ever seen.