I'm not giving him flak. I agree he is a good baseline player and not a star.
What do I expect? I expect a guy who hits 19/20 home runs to have a higher OPS+ than 95/97. For 2019, I admit I have not done the research, but 36 home runs with an OPS+ of only 124 seems improbable if not bordering on impossible. The rest of his game has to be sorely lacking to manage that!
For what it's worth, Kepler's 2020 and 2021 are now statistically identical, which is to say back at a decent baseline player, but it's been very feast-or-famine to get him here. I think we'd all be a lot happier if he just showed consistency, we don't need him to be elite.