The anime has been in production so long it's extremely hit or miss, depending on where in the show's run you look. The effort put into the production falls of a cliff several times. It's part of the reason I personally can't stand it in comparison to other anime series or even the manga.

It's a pity, some of the OP movies are excellently produced and I'd really like it if a version of the whole story with FMAB level production quality existed. But that'd be a massive undertaking at this point, so it is unlikely to happen.

The episodes airing currently have pulled their shit together on the animation, but they are still re-cycling the same old OST recordings and SFX samples, making the anime unwatchable for me.