@BaronKreightOP isn't completely wrong. The weapons are not a disaster until you reach the level where everyone plays with an aimbot or is the 0.5% of player base that has one built into their brain from birth. Pretty sure this is the "snipes with flatline" crowd you're talking about. I've come across them from time to time but not very often. Either they're fewer than people say, or sbmm keeps them away from me effectively, or everyone who complains about them is better at this game than they would like to have us believe and therefore matches against them more commonly than I do.
And I think the "mobility is all that matters" theory holds true, but only for the run-and-gun crowd. People like the OP, who have the patience to play the long game, can find success without the ability to swing from trees or teleport halfway across the map in a split second. Personally I like swinging from trees AND playing the long game, and it seems to be a reasonably effective combination, although I'll readily admit I'm far, far from masters/pred.
In any event I think what you're reading with the original post is that skill level, playstyle, playlist, and matchmaking, all come together in a variety of ways to produce some remarkably different experiences in this game. No, I'm not playing at the highest levels and that may well be why the OP and I are more or less on the same page - a very different one than the more competitive players are on.