Alright, I understand this is all opinion, but I must address some statements that have been made:
1) Too few Ghost-types. Gen I introduced 1 new Ghost family; Gen II, 1; Gen III, 4 (Shedinja included); Gen IV, 5 (Froslass included, Dusknoir not); Gen V, 4, all of which have multiple evolutions. Thus, the amount of Ghost-types is indeed higher than it has been in any generation, while the amount of families is similar to that of the previous two Gens. It's the same for the Fire- and Electric-types. Perhaps you guys are just forgetful, but there were plenty of Pokemon representing these types.
2) The pixelated battle sprites. This is a result of three converging factors: the new battle camera, moving sprites, and the retention of a traditional spriting style. Sprites have always had the same amount of pixels. What's happening now is that the camera and battle movements make the individual pixels more apparent. If you want the battle sprites to be of higher resolution, you are basically crushing nostalgia for others. The sprites would no longer look like those to which we are accustomed.
3) Rival battles. More rival battles allow more chances for EXP gaining, a deeper story, and more of a challenge. Someone said that these more frequent encounters are reminiscent of Gary Oak. Good. It was mentioned that you have to battle N fairly often. This comment actually stupefies me. You have to battle him 5 times throughout the story, with each occasion adding more to his tale and further unraveling the mystery surrounding Team Plasma. If it is the fact that you are battling that irks you, perhaps you should find a different game to play, considering Pokemon is a game of battling.
4) The C-Gear. I get the feeling this thread contains posters who do not, for the most part, have friends who play Pokemon. Otherwise, they would know the value of the C-Gear. It allows for quick battles and trades, the ability to go in another player's game, and the ability to access the Dream World, among other neat things. The difference between accessing the C-Gear and accessing the menu screen is a press of the X button. It's manageable.
5) Level grinding. Audino. The Lucky Egg. The experience Pass Power. Trainers in the Nimbasa sports arenas. The new experience system based on comparative level. All of these factors lead to perhaps the fastest level grinding ever.
6) Removal of the Stealth Rock TM. Game Freak did this because Stealth Rock was annoyingly good at singling out certain Pokemon, such as Beautifly, who already didn't have much going for them. Giga Drain and Drain Punch are no longer TMs because their new base power makes them godly, and thus, they are to remain somewhat exclusive. Someone said Drain Punch's TM now contains Peck. It contains Quash, and if you can't figure out how to use it, you aren't thinking hard enough. Clearly, it's for Double and Triple Battles. I suppose most of you are accustomed to Single play.
Music and game aesthetics are always debatable, so I'll leave those untouched. You can continue to dislike the way that the topics that I touched upon were handled in these games, but know that it would be considerably worse and less popular if they had been handled in the way you imagine they should.
Also, one last thing. Too many bridges? Unless the poster of this comment has experienced some trauma concerning bridges in his lifetime, I don't understand this statement. New York City has many bridges. Bridges showcase the new camera angles. Bridges contain some of the best music. Bridges contain the EV Wings. Skyarrow Bridge allows for a very long and straight path that is ideal for breeders. Why are bridges a symbol of hate?