These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Breather Level: In the round immediately after a cutscene, the ghosts stay blue for longer than usual.
Can't Unhear It: Has anyone who has seen the animated adaptation been able to play the game and not think of Marty Ingels?
Contested Sequel: Pac-Man Championship Edition DX to the original PMCE. While some players enjoy the massive ghost trains, varied mazes, and intense speeds, various players find that DX is too focused on following a strict and rigid path compared to its predecessor.
Even Better Sequel: While Pac Man: Championship Edition received positive reviews, Pac Man: Championship Edition DX managed to get above 90 in Metacritic.
Ms. Pac-Man is also a huge step-up from Pac-Man, which was awesome to begin with. This is doubly true for the Atari port of Ms. Pac-Man, which fixed all the problems of the Pac-ManPorting Disaster and was a legitimately fun game.
Fanon: Pac-Baby refers to two different characters. The original was Junior as an infant, the other is his sister.
Most remakes that aren't direct ports of the arcade version tend to water down some of the subtler mechanics of the game, most notably the ghosts' AI. The difference is imperceptible to the average player, but to those who have memorized the ghosts' AI from the arcade version and based their playstyle around it, the difference can be quite jarring. It's the total aversion of this trope that makes the Google version so awesome to play.
Spectacularly averted with the Atari 2600 version of Ms. Pac-Man, showing just how avoidable the 2600 Porting Disaster of Pac-Man was. It was so spectacular that a Game Mod was developed years later where Ms. Pac-Man was hacked into being Pac-Man Arcade, showing one example of what the Atari 2600 version could actually be like.
Sequelitis: While Namco was pleasantly surprised with Midway for Ms. Pac-Man (and has since bought all rights to the game and character), they were less pleased with Junior Pac-Man and were downright furious over Baby Pac-Man, causing Namco to break its relationship with Midway. Fans tend to be of the opposite opinion however, regarding the Midway-produced games as being decent-to-awesome, and the Namco-produced Super Pac-Man to be the worst of the arcade games.
So Okay, It's Average: The general view on any game other than Pac-Man, Ms. Pac-Man, the first two games of Pac Man World, and the Championship Edition games.
That One Level: All of World 5 in Pac-Man Arrangement. You get absolutely no room to breathe in any of the levels in that world. And the ghosts move so damn fast that you die before you even get to eat those last few dots. And that damn boss isn't a cakewalk, either.