OS - Hyperactive beginning of Legend, more active humour, all silly is fine because - it's beginning, now great like Mighty Morphin Power Rangers and classic Sonic games.
AG - Real Advance: continuation of old formula with new ideas, Ash starts growing up, more serious battles, more serious villains (but - ending of their storyline - fail), humour now more balanced, contests, overhated Max and second Ash' grand victory (BF).
DP - Continuation of progress, more suspense, more serious tone, much better real villains, humour still in balance with growing up, most strongest female companion, more awesome contests, one of the strongest Ash's team, touching episodes for Jessie and James, the best League and imbalncer Tobias.
BW - Freakin reset, bunch of wasted potential, Ash got amnesia, silly reproduction of Paul, silly reproduction of Charizard and Infenape, ruined war TR vs TP thanks to earthquake, the weakest Ash's team, most annoying female companion, underrated male companion, worst League, and - cutie Oshawot.
And - humour at least kept himself in hands.
XY - strong and growing up story, coolest and kick ass Ash, Ash-Greninja (FINALY! ASH'S WATER STARTER IS EVOLVED!!!! AND DON'T GET GRASS STARTER!!!!!!), most joyful like family group, joyful humour, most development female companion, most emotional moments (especially - end), right direction for progress - In side of Shōnen, and Team Flare Attack arc - is Most Epic Episodes in whole series!
SM - Very-Very weird experiment, WHAT THEY DONE WITH ASH'S (and not only) FACE, horrible-cringy and annoying (and sometimes - insulting humour), rushed story arcs with potential, tooth dumbest idea in anime ever - send and without this experienced hero to the school, to killer of key elements of franchise - adventures and regular battles, Milotic punch to Ash's "Poke Balls", "Too Much Water" (@IGN), and - BRING BACK GRENINJA, IF YOU WANT SAVE RATINGS FOR FINAL EPISODES. And - R.I.P., original Oak...