I think Castro was pretty well appreciated by fans, though it is a pretty subjective award. There's a strong argument for him being their most valuable position player flat out though considering how much better he hit in big situations than he did overall, and that might not be fully appreciated.
Taylor did seem to be more under the radar to me and was similar also in how he got big hits a bit more often than you'd expect from his overall line. His defense was sorely needed too.
I also want to shout out to Jeffers. Obviously he had a great offensive season, but I'm not sure that he wasn't the better defensive/game calling catcher also. The advanced defensive metrics still point to Vazquez, but Jeffers was slightly better at throwing out base stealers, and his catcher ERA was 3.61 to Vazquez's 4.09. The last number could be misleading without adjusting for who they caught more often, but I do think Jeffers calls a really good game, and I think it's still underappreciated how solid of a defensive catcher he's become.
Oh and his offensive season? Same wRC+ (138) as Mitch Garver, who also had one of his best offensive seasons this year.