It's impressive how much they managed to get right in the first installment. One thing I'd really say "needs" changing is the menu which is missing some crucial QoL stuff that was added in the sequels.
Actually way ahead of its time in a lot of ways - the movement mechanics, customization, and writing in particular - but a lot of discussion around this game (and the rest of the series) unfortunately revolves around the control scheme, which is very much of its time. Hopefully with the release of those analog control patches these games will start getting the respect they deserve.