Just to get down to brass tacks:
In the past couple of years Japanese anime has taken a huge in animation and quality, and originality imo. The only original show that was great was Puella Magi Madoka Magica.
You've roped together quite a number of divergent factors in that single statement.
If we can assume that 'animation' is a sub-set of quality and by quality you mean overall production levels then I'd have to disagree. Production values are roughly at the same level they have been for years and years. Some shows look great, some look awful.
Originality is something that anime has always struggled with but that's true in most mediums so I don't see why anime needs to be picked on in particular. There's a lack of originality in triple-AAA videogames and blockbuster movies too. It all stems from the same basic source - whenever you're making something that costs a lot of money you want to appeal to the widest possible audience and so creators tend to play it safe.
The only time you could argue that more original anime was being produced than at present was during the height of Japan's bubble economy in the late 80's when everyone had too much money and could afford to back crazy projects. That wasn't the case before the bubble and it certainly isn't the case now so it's hardly a recent development.
Even still independent animation still exists and more 'unusual' works are still produced for example the series of anime OVA's based off successful short stories for women or the OVA's produced with the help of the Japanese government that were designed to train animators.
Every new anime season is made up mostly of moe anime and school setting which was made thousands of times and basically unwatchable to me.
Moe is a very vague term that gets tossed around a lot online but if we're talking about anime designed to appeal to a certain subset of otaku who are only interested in 'cute girls' then there's admittedly a number of those shows being produced every year but that's been the case for awhile. It hardly drowns out everything else that's being released.
High school has been a setting in anime and manga for decades and will probably continue to be a setting for sometime to come as long as people consider it to be the 'Golden Years' of their life before their stuck being a salary man etc. This isn't anything new. You can chose to watch or avoid these titles as you please but I wouldn't recommend writing off every work has highschool as a setting because then you're going to miss excellent works like
The Flowers of Evil. As is the case with most things, every title should be examined before making a decision on whether or not to to commit time to it.
Even adapting anime from manga is mostly bad because the anime is not faithful to the manga and has plenty of fillers.
This has also been the case since time immemorial as the majority of anime produced is an adaption of something, usually a manga. There's literallt thousands upon thousands of these adaptations and they don't really share any common similarities in terms of how they are adapted because of the differences in terms of the staff that are working on the adaptations. I can't possibly see how you can draw such a broad conclusion about the majority of anime unless you've personally seen the majority of anime ever produced.
In general, there's a lot of sweeping generalizations in your argument. Your points certainly stand for a number of shows being produced but then, so what? Avoid bad shows, watch good shows.
The vast majority of anime is bad, just like the vast majority of work in any medium. You need to examine each title on it's own merits and see what people say about it before committing your time to watching it and then you'll probably have a better experience.