To me, AG was to me as Johto was to Scott85/Cybercubed.
I absolutely hated it. The Gym Leaders were portrayed as being similar to Team Rocket in the sense that they lost to Rookie Pokemon far too easily (especially considering the fact that this was Ash's first time that he had to rely on a completely new team.), they had Ash stay in the Top 8 despite the fact that they already had Ash breeze through 3/4ths of the Gym Leaders with his "rookie" team, thus making the Gym Leaders seem even more pathetic in the process (And considering how their losses were too similar to the time that Ash's Caterpie, despite having not only absolutely no trainer battling experience whatsoever, especially in comparison to Koffing, Ekans, AND Meowth, but it was also barely even functioning thanks to its fight against Pidgeotto, it tore them apart as if they were tissue paper, that's saying a lot.). Misty had left to become a Gym Leader (and considering how they had treated the Gym Leaders in Hoenn, I'm guessing it's to mock her and act as though she's so weak, that she should be a gym leader where she will be beaten by rookies endlessly instead of growing stronger. Brock also returned, despite having to return to the Gym [not to mention that his Gym was in far worse condition than Misty's Gym, and thus should have gotten the boot], and his addition was even more pointless than in Johto. They also included your typical female bimbo stereotype from other animes/series, May, as Misty's replacement, and her reasons for joining and even doing Pokemon Training were extremely poor reasonings to begin with (So she wanted adventure? Big Whoop! You can't be a Pokemon Trainer if you hate Pokemon anyways!). Not to mention that the way she was designed was a very poor example for little girls. The Battle Frontier was placed in Kanto for absolutely no reason whatsoever (it certainly wasn't to advertize FRLG, since they only had Squirtle and Bulbasaur.), and Leaf, a girl actually FROM that game, was replaced by, you guessed it, MAY. There was barely anything related to Emerald other than the Battle Frontier. Which reminds me, seeing how the Battle Frontier was located on an Island in the games, they should have placed it THERE and they should have given May (if she had to appear) one of the Johto Starters to advertize the fact that the player can get Johto Starters after receiving the National Dex. They barely even referenced Kanto at all, despite the fact that they were TRAVELLING IN THAT REGION!! Brock's Gym was tarnished yet again, and yet he irresponsibly doesn't take over the Gym, despite the fact that not once, but TWICE the gym had gone through a disaster that was far worse than what Cerulean Gym would have gotten itself into had Misty not returned. Also, the entire Battle Frontier Arc was rendered even MORE pointless after Ash's Pikachu, despite defeating Brandon's Regice, who not only was the pokemon of a trainer whose skills would rival that of even a champion, but is also a Legendary, and Pikachu defeated it ALL BY HIMSELF, would end up becoming even worse than Team Rocket later on in terms of battling skill. By the way, about Misty's reason for being at the gym, even though that was the episode where she caught Gyarados, the reason was just poorly thought of and ultimately pointless (She has to run the Gym just because the PIA would shut it down if she isn't present?! Fantina had left the Gym for far longer than Misty and her sisters did in DP, and it didn't even come close to being shut down. Not to mention that Pewter Gym somehow was allowed to continue operating as a Gym despite failing 2/3rds of the test, and Wattson's Gym would have suffered the same fate (the way to enter ALONE would have been enough to shut it down before they even give the inspection!). Honestly, AG was just horrible.
EDIT: I may not have watched it, but I have researched far more into it than you could imagine.
EDIT2: I also thought of another reason why I hated it. In the Kanto Grand Festival, despite May having done much better than before in regards to her rank, as well as beating Drew, she still cried when she lost to Solidad! Honestly, why even bother crying?! You did much better than before! The only thing I could think of is that she's a sore loser! I mean, Ash, under similar circumstances in the Johto League, never cried, so why should she?! I also hated the Manaphy Movie, especially May's role in it and how she went chicken at the ending in regards to Manaphy being kidnapped! The only redeemable factor of the movie was that there were water pokemon in it. Honestly, the Manaphy movie was far better suited for Misty. I'd reckon that if Manaphy was kidnapped by Phantom in the ending and she was there, she'd actually try to save it.