Regarding the Decepticons agreeing to banish the Decepticons, as I recall, it was revealed in a later episode that this was a ruse to get all the Mini-Cons in one place so they could take ALL of them. That's why the opening scene had the Mini-Con ship being hit by mines and stuff.
However, the Autobots were able to hold off the Decepticons long enough for the Mini-Cons to warp out.
According to BotCon 2002 reports of the time, people went crazy when they saw the reuses of G1 character models for generics, the voices of David Kaye and Garry Chalk, and of course, Armada's version of the G1 Transformers theme music.