I actually thoroughly enjoy fighting gank squads, when you invest alot of time into the PvP, you learn certain things like proper spacing, how to predict where the opponents weapon arc is going to land and being just out of range to get the whiff punish, pushing your advantage when you predict they will be defensive (roll catching etc) and knowing when to back off and not push the advantage even when their health is low, landing crits in the heat of the moment when you know they are in r1 spam mode. You get better at the reads (gankers are all the same and make dumb decisions). Having said that, summoners know they have a massive advantage and get massively butt hurt when things don't go their way (I blame the devs for catering to this whiny emo casul playerbase). The devs have developed PvP in a way that has driven away the novice/strong invaders in this game, and left only the veterans who live eat and breath dark souls PvP. I've noticed increasing butt hurt from gankers lately for this reason, in previous games in the soul series you'd see alot of good players who ganked aswell, it was still easy, but posed enough of a challenge that it retained somewhat of a competitive element that made it interesting and fun which is basically a turn off for people who enjoy abit of challenge (basically most of the soulsborne player base). So now all that is left are a bunch of spoiled brats ganking cause it's "easy", but they too will leave as invaders get smarter/ filter down to only the strongest players.

TL;DR Invaders getting smarter & gankers getting dumber