You're right that some people will criticize Pac whatever happens.
But part of it is this:
If Pac fights a come-forward guy, it's entertaining but he wins in dominant fashion.
If he fights a more defensive guy, it's less entertaining but he has different things to deal with.
Some people want to see an entertaining fight, and everything else is secondary. Others want to see the best fighter get his hardest tests even if it doesn't look pretty.
And then of course you have some who want everything and will only focus on the negatives. There's no pleasing them no matter what.
Personally, I'd like to see him take on his toughest test next, even if it isn't that entertaining. Not sure whether Bradley or JMM will make for a more entertaining fight (my guess would be JMM) but who they choose should be the toughest test available.