Concerning Bakula's portrayal of Archer, I understand that many people don't like it and feel that he overacts. I felt so too for quite some time but after I got used to it, it seemed very natural to have a captain who has not been through specific training, after all he is the very first human captain in deep space. It's not like he can go by the book, as no book about how to make first contact, how to deal with hostile aliens, etc. has been written yet.
He also conveyed the excitement of exploration which got a little lost in the previous shows.