Yoan Moncada was the #1 prospect in baseball. His expectation level is heightened because of that.
He had a OPS+ of 116 in 2021 (good) sandwiched between a below average 2020 and so far, a bad 2022 at the plate. Even the good 2021, he only hit 14 HRs. If Yoan Moncada has pleased your expectations for him, then good for you. But I expected more from him when he was acquired. Good, solid player. Has not been the star we all had hoped for.
Grandal started 2021 hitting like .185 until June although he was drawing a ton of walks. There's going to be some fans who get mad about a sub .200 batting average (even if it's not considered too relevant in the modern game, especially if you're drawing walks and hitting for power). He had a monster 2nd half and I don't think there was much complaining about him. He was maybe our best offensive player in the 2nd half. I don't recall a lot of hate about his offense. He also signed a big free agent contract so carries expectations.
Joey Gallo would be coming here with no expectations. If he hits here like he did in Texas, he wouldn't receive hate. At least not from the vast majority of fans.