He's fine if you need a big guy to stand there and not get out-muscled. Terrible on the ball, can't pass, and he's not very good with his head for someone so tall.
The inconvenient truth is that there's no great solution to this puzzle. There's not one CB in the squad who isn't without flaws and no perfect combination of CBs to play.
It's like last season never happened.
Williamson is fine as a 4th choice CB and for the occasional spot start. When clubs count on him playing each week, he's easily exploited.
Shut-down HBA and you basically shut-down our offense.
Strange, we looked much more of a threat in the second half and he wasn't on the pitch.
Everton also didn't actively try to score in the second half.