Robocop 3 had some cool ideas and Fred Dekker made both Monster Squad and Night of the Creeps so he had the chops to direct a good film, Basil Poledouris was back, and Gary B. Kibbe was a good cinematographer (worked with John Carpenter for a long time), but it no longer had Peter Weller (a shame as he didn't do it due to scheduling conflicts but the movie came out a couple years after it was filmed anyway) or Dan O'Herlihey, they killed off Nancy Allen's Lewis early and unceremoniously (several deaths felt shortened due to violence, C.C.H. Pounder's character as well), it was stuck with a PG-13 rating to get kids to watch it due to the action figures, videogames, and cartoon (Ghostbusters 2 suffered similarly but the original Ghostbusters was a PG-13 film at best anyway, probably should have been PG), but the plot itself was weak (again some good ideas there), and the whole thing kind of felt rushed, gimped, and cheap. They also no longer were filming in Dallas or Houston like the first two films (respectively) so it just felt different.
The main villain was pretty weak too, not really the actor's fault as he came across as a douchebag you want killed, but he had nothing on Dick Jones, Clarence Boddicker, or Cain. Just lacking both background and personality.
The Rehab villains were never really explored or explained properly to build them up and in general they paled compared to Boddicker's or Cain's gangs who both had way more personality and background. The Splatterpunks could have been cooler had they not been PG-13'd and been more like the Death Wish 3 gang. The robo-ninja (well, ninjas) was cool and all but again under-utilized and with these three distinct villains/villain groups, plus OCP it felt like throwing a bunch of things at the wall to see what sticks. You'd bneed a longer rated R film that was re-written to really get the most out of the concepts within.
Terminator 3 just flat out suffered due to being entirely unnecessary after T2 ended the series perfectly. It had some stupidity like the "talk to the hand" with girly glasses trying to be the new "hasta la vista baby", but it was competently made, just not needed at all. Having an entirely new John Connor, and undoing the end of T2 were also huge demerits (much more so the latter; I know Edward Furlong had drug troubles so I can't blame them in doing a re-casting), but Terminator 3 is still significantly better than Genesys or Dark Fate.