Are the Prequels bad? No.
Anyone is allowed to like the prequels, doing so is just expressing one’s personal opinion. However, I firmly believe that anyone who doesn’t think they’re objectively poorly executed is either not paying attention or lying to themselves. That makes them bad.
Well it depends on one’s perception of bad. Is it Plan 9 from Outer Space/Jaws 4/RoboCop 3 bad i.e. they are just terrible all around?? No. Is it bad in the sense that there’s a lot over acting or perhaps in some cases underacting, overly clunky dialogue, unstable storylines, and way too much CGI?? Yes. Personally I find the PT harder to follow then the OT which is partly why I don’t watch them as obsessively as the OT. But then again every movie is flawed to a degree. I admit the PT has its weak spots but what I can do about it?? They exist so I accept it.