3.5 is the only D&D edition I'll run any more. (I will run other, non-class&level games, however) It does have annoyances, but later editions have kept the parts I find annoying while dropping the parts I really like. In particular, I like 3.5e for having a skill system that was actually halfway decent, if often over-fussy.
My Brotherhood of Rangers game is 3.5e with gestalt rangers as PCs (fighter-ranger gestalt, rogue-ranger gestalt, wizard-ranger gestalt etc), started at 6th level with slow advancement and the various 'travel' spells combed out to give what I believe is a more 'rangerly' feel.
If I start another 3.5e campaign, it will most likely be what I've dubbed "2e6" - like e6 but with character levels up to 12th but class levels limited to 6th. Thus multiclassing will be required (at least after 6th level) and spells will be limited to 3rd level and less. (And a blanket ban on 'prestige' classes.)
There are some things from Pathfinder 1e that I like - and sometimes have independently worked out & adopted as 3.5e house rules. But I didn't and don't like it overall, thus my sticking with 3.5e D&D