I think most people who criticize gear are not serious powerlifters. As a casual observer or general fan of sport, the thing that is impressive about powerlifting is the sheer amount of weight a human being can move. Once you learn that the gear accounts for a portion, albeit a small portion, of the lift, some of the awe factor is removed.
Now I’ve heard the use of gear in lifting compared to the use of equipment in other sports. In the extreme I’ve heard people say things like “without the race car the nascar driver wouldn’t be able to go as fast” and things like that.
But the reality is that in most sports the awe factor is found in how the athlete uses that equipment (e.g., he’s a great driver in the race car example or wow that ballplayer has a great swing). In powerlifting, that is not the case. No one is ever going to watch a huge lift and say “wow he can really make the most out of that bench suit!”.
Sorry for the long post, but I really think this is the reason so many people feel that lifts with gear are not as impressive.