I never got the chance to watch this series during its original run on cable and my first experience of this series was on DVD and after watching this series in its entirety (through Season 4) I must say that the ending to Season 4 was much too negative for a series to end like that.
I don't plan on wasting my time picking up the Season 5 DVD's because the whole premise of Season 5 about a darker universe and being trapped within a single solar system is too absurd for a science fiction series too remain too limited to a single plot thread.
While this has been an enjoyable series I think there should have been some resolution during the last episode but it was a very nice ending to the series considering that with Season 5, the directors, producers and creative team seem to run out of story ideas much like what happened with Season 5 of Babylon 5.
All in all, Andromeda (Season 1-4) deserves one of my best recommendations, if you're looking for a new series to get into. If you're looking for an original science fiction series to watch that doesn't contrain itself to the norm (i.e., Star Trek) than I'd suggest such shows as Andromeda, Farscape, Stargate SG-1, Firefly, Roswell, Dark Angel and Babylon 5 (Season 1-4). These are highly recommendable shows and deserve a special look.