2.) Voyager - I really enjoyed the writing, From present day getting our technology from spaceships (from the future or not) I agree... think Roswell in 1947 and the invention of the transistor 2 years later, cooincidence, I don't think so. The Borg... need I say more... very well written
3.) Enterprise The last season was really good, I was upset to see it cancelled.
4.) Tied DS9 and ToS Although the Dominion war was really good, so I might give the edge to DS9.