I wholeheartedly disagree. I took a break in the middle so I can't say much of anything of Gens 4, 5 and 6, but I've been keeping up with Sun and Moon and I'm absolutely loving it so far.
First of all, people just don't seem to have much of an appreciation for different animation styles. This reminds me of when The Wind Waker came out and a ton of Zelda "fans" instantly called the cel-shading style garbage. Years later a lot of fans and critics praised the game as being a work of art for the same reason that years earlier some people called it trash.
Going back to the world of anime, there is a lot more variety in the animation styles than what you'd think. Just look at Kill la Kill and it's completely hammy, over-the top style, the vivid colors and the rough edges. Most people loved it anyways because it was made by some guy from ex-Studio Gainax, but it was definetly out there as far as animation styles go. Or go look at the more recent Flip Flappers, which had a very artsy style and some really amazing colors. Then there's some more experimental stuff like that one Ping Pong anime whose name I forgot (I didn't like that one but kudos to them for doing something different and it was actually critically acvlaimed too). There is just so many different styles that are amazing for so many different reasons, but some people just can't stomach anything that is different from what's considered the traditional anime style in the west (which is ironic, because the traditional anime style was more like what you see in Doraemon and Sazae-san. The "traditional anime style" we know is simply the style of the first few popular animes that were exported to the west such as Dragon Ball, Pokemon and Digimon).
The art style of Sun and Moon is actually very reminescent of The Wind Waker. There's no cel shading of course, but it's a lot more cartoonish compared to previous seasons, with the characters being a bit more round around the edges and with more vivid colors. Personally I like it and Pokemon has my congratulations for exploring with this style despite the potential backslash.
As for the story itself, I don't know if we're looking at the same anime because I'm really liking it so far.
This is a really random thought, but I actually find the thought of Beware replacing the Blasting Off Again routine to be refreshing and actually pretty hilarious. Team Rocket even lampshades it by saying something like "is this going to be the first time we blast off here?", looking pretty happy, and then Beware jumps out of totally nowhere and takes them away. Speaking of Team Rocket, it's actually really nice that they don't show up every episode and actually let the story progress a little more smoothly. Oh, and Meoth's near death experience was hilarious too xd Funny how Pokemon recognizes that Gardevoir is somewhat fan servicey.
I've heard some people say the rotom-dex is annoying but I think he's pretty funny, specially how he reacts to Satoshi's antics (like how he's totally shocked at how rowlett basically caught himself).
While I'm at it, the comedy in the show is pretty great. Everything from how Mao and Satoshi look totally not amused by the Professor's lame pokepuns to how Satoshi keeps getting rekt by random pokemon but always ends up being fine is pretty funny. And my god, Rowlett is absolutely adorable. The chapter where he appears he's such an airhaid and it's super funny. There's a lot more that could be said but I find the comedy of this show in general to be great.
The characters are all very likable as well. The MVP is definetely Lillie though. She's so cute, and the episode where Pikachu trolls the heck out of her and bumps his head into her hands is amazing. I'm really curious to see the anime explore more of her background and her relationship with her family. I can alreafy guess Lusamine has something to do with why she's so scared of pokemon, but since I haven't played the game (I don't own a DS q.q) I don't know what's going to happen, so I'm hype for that.
Overall the season is looking very good and I hope you would give it a chance. To me it seems that you do not appreciate the series for what it is and that you were expecting more of the same from the first few gens. But what's the fun in that? Let them experiment a bit. In my books at least, the experiment that has been Sun and Moon has been successful.
I've watched over 100 different anime series over the years, so I know pretty well when I'm looking at something good and when I don't like what I'm seeing. I know there are people who have watched even more than that, but I think I have enough experience with anime to tell good anime apart from trash.