Just finished the 4th and final season. Gotta say I'm truly impressed with the entire ST Enterprise adventure. Perhaps more so than any other ST series, and given that TNG has been my measuring stick that statement from me is significant. In fact I lamented the close of this series perhaps more so than any other. Can't say enough about it!
Way great writing, acting, effects, plot arcs, etc. Totally consuming.
Cheers,
RR