My problems with Enterprise spring up when they tried to tie it in to the rest of Star Trek. Example: The Borg episode from season 2. Not only were the Borg unnecessary in Enterprise, but they try to tie into both First Contact, with these Borg having been frozen in the arctic for almost 100 years, and then into TNG, with the comment that they may have just postponed the invasion for a couple hundred years (basically until we first see then in TNG). Or in the first season when the Captain hoped stat, someday, someone would write "a directive" as to what they can and can't do, obvioulsy refering to the Prime Directive.

The show was alright, and it was fun, but it screwed up a lot.