Ezzo has been pretty much discredited in the US except the breakaway group he started up when he was rejected by his peers. Discredited by Christians and child health professionals alike. He has zero credibility.
I'm a disenfranchised raised-christian (no longer identify myself as Christian, not interested in coming back into 'the fold') so you can take my post with a grain of salt, but I did look into Ezzo after I started innocently reading the book, prior to first parenthood, and was very alarmed when I started to ask questions about the book. I even upset my mum (before teh questioning started) by asking her how she did things with me and thought I had figured out why i 'went wrong'. I was so angry with myself and Ezzo for leading me up the garden path.
The best book that transcends sect-ish trends is Unconditional Parenting by Alfie Kohn.