It's such a shame. I religiously replay the Arkham games, to this day! And I still get the wonder and satisfaction as I did that first day playing Arkham Asylum back in 2009, whether it be the combat or collectibles and how simple but satisfying those games were.
Gotham Knights looks fantastic and cool in terms of the many unlockable suits and such (even if there isn't a particularly straightforward way to unlock them as much as you just happen upon unlockables). The 30fps cap in the actual game is a big downer. They've tried to innovate and add features to it, which is a great idea, unfortunately, it makes the game a little too complicated. The UI is confusing, it's such a shame that it's just button-mashing to defeat someone. There's nothing that makes the combat worthwhile at all. If the combat wasn't so mind-numbing, I'd enjoy this game much more.
All that being said, I do still like all the really varied designs of the suits! Also, love the varied combat styles of the heroes and moves they have. It's a nice touch to have the protagonists show up in the main game title screen, in the suits that you have customised for them in the game itself...