I will say season 3 is an improvement over 1 and 2. I have no intention of not finishing the series now. Maybe it's better I watch it now and I didn't see it back then when I would have been judging it against other Star Trek series and been exposed to the constant week to week criticism on this site.
The time travel episode to 2004 was unnecessary. Enterprise overused time travel, having a time travel episode in an arc that's based on time travel is putting a hat on a hat. And it wasn't that interesting a time travel episode anyway.