Unless you have actually taken the time to look up Calvin (His institutes are online), you should say this or that about him. You need to see for yourself.
Might I make the same request for yourself with regard to Orthodoxy; hit up a parish and see for yourself.
I have seen several extensive excerpts from Dr. Eckleburg. In some instances I went to the CCEL site and read up a little bit. This is how I formed my impressions. You cannot ask me to read a thick book when on half a dosen instances chosen by a Calvinist to debate Catholic viewpoints I see gross indifference to the scripture, a lot of extrascriptural philosophical speculation, and a lot of frothy invective agains the "schoolmen".