UI was terrible, that's true. A lot of other stuff was bad as well, it would make a huge list, a lot of terrible dev and game publisher decisions as well.
But Ark: SE had large variety of game mechanics involved, that no other game had nor ever will. For example taming, breeding tames to get the best characteristics, colours, raising them, using them as a mean of transport and as a killing machines. That made a big part of my experience.
The joy of obtaining your first Ptera, then Quetz and Griffin (best cargo hauler and flyer respectively) on an each new playtrough, is something I miss a lot.
Yes I like flyers, and the griffin flying mechanics were something else.
And note that when I talk about Ark: SE, I talk about modded private PvE servers exclusively. It was a great experience for me back then in 2018, and nothing came close to it in that manner. Played Conan Exiles for some time, not my cup of tea. To me, Ark: SE was a game of freedom, and all its drawbacks were just a small part of an overall experience.