I think the covers Chan did on BATMAN (roughly 262-283) demonstrate what both of us disliked in Chan's work. It was especially a blow for me when the creative team went from O'Neil/Novick/Giordano to David V. Reed/Chan. Few series have taken such a dive in quality. BATMAN in one issue (266 to 267) went from being my favorite book to one I intensely hated. I especially hated Chan for being O'Neil and Novick's replacement.
Although I didn't have as much resistance to Chan while he was inked by Giordano in BATMAN 262-264, where his art was less of a jolt from what I was used to. His pencils (also inked by Giordano) in DETECTIVE 447-448 were also fairly nice and consistent with the Novick/Giordano/Aparo runs.