Is it the worst? No, not by a long shot (thanks Superman 4 and Catwoman, you set the bar too high), but it is not a good movie either. Some people has started to a) react to the post-Nolan "everything we do is gritty, angsty and serious business" by clinching to everything with color like it was he second coming, or b) catch the movie up with the nostalgia glasses (the movie is 20 years old, after all), and remembered that they saw it when they weren't supposed to (the movie is PG13), which colors their take on it (which is natural, it colors my take on duds like Cool World). If you are one of the people that can find enjoyment out of it, sarcastically or otherwise, more power to you... However, the movie is bad.
It sure has a lot of cheese in it (at least, far more than expected), but what is there is inconsistent, unearned and just not very good. It is like asking for a burger and having some drops of cheap sauce in it. If you like the sauce, it is too little and random to savor it with the food; if you don't like it, is prevalent enough that the taste would hurt the whole meal.