The controls themselves were fine imo but the gameplay had some terrible design flaws like the AI partners being rather useless and the Subterranea missions. Subterranea was a dungeon-crawling mode that was frustrating in the sense you had to complete it twice per character (with an increase of 5 floors on each mission) and it involved backtracking in and out the quarantine in order to reach that zone everytime. It was fine at first with Akiyama, but it became particularly tedious when doing with Majima and Ryuji.If they did a HD version on PS4 and PC with a stable framerate, and reworked controls (I heard the controls were ass), I imagine it would be better received than its original PS3 version. Though considering how it went over in the west, I doubt they would, sadly.
I also remember it was easy to get yourself stunned repeatedly by normal zombies on the highest difficulty run which was more or less a slow ride towards the game over screen if you got ganged by a group of them at once