Did the EGA create level gaps between guilds/friends?
No.
Did the EGA make many future customers feel left out?
No. Any customer you're alluding to here is not feeling left due to Bioware's fault. Their own lack of reading comprehension is to blame.
1. Early access was originally described as 'up to 5 days early'. If you can not critically read and understand that you were not guaranteed 5 days of early access, nothing will help you succeed in the real world.
2. When the extended early access was announced, it was indeed written, albeit at the end of the email, that early access would be determined by the order of pre order code redemption. Again, the inability to comprehend the process created any feelings of being left out.
Did the EGA make the forums look like we're mostly all 5 year olds?
As was already adequately said, no, you do that on your own, both by your childish ranting, and your lack of reading comprehension.
Did the EGA show us the lack of communication we can expect with Bio-Ware?
I understood everything communicated to me just fine. Does the EGA show us your lack of communication skills? May God have mercy on you, your life will be hard.