Not being an ATPL yet, I can't talk about the technical aspects of the 737 vs Airbus argument.
However, the fact that an airline is willing to put faith in the market to that extent is very good news for all of us, wanabees and existing pilots alike.
Moaning about EJ's service etc. is all well and good but from a purely pilots point of view this is bloody good news, irrespective of which aircraft they eventually buy. I'm pretty certain that if EJ offered any one of the un-employed pilots out there a job they would bite their hand off. One thing I am 100% certain about is that if pilots continue moaning at good news like this then there are plenty of people ready to commence training or part way through it who are very hungry and more than willing to take your places.