I came in to say the same thing. Using the latest sliders and, while things have improved, there's still the issue (for me at least) underneath that the AI doesn't seem to know how to attack.
I'm playing in the SPFL (on Legendary) and I've got a formation and tactics which suit my players perfectly. Playing against Celtic or Rangers the right amount of challenge is there, because they attack and they're effective.
Every other team in the league gets to the half way line in possession, then passes back to the centre-halves before doing the same thing again, over and over again. I score most of my goals high-pressing until they make a mistake, burst through and score one-on-one.
No teams play long balls, no-one favours wing play, no-one breaks me down. It is BORING. There must be some way to adjust the sim settings/AI sliders so that they actually attempt to play football.