definitely one of my favorite star trek spinoffs - of all of the ones, much more original than TNG (which was pretty much ST without kirk banging chicks every planent) as far as general concept goes. plus, who doesn't love commander dax ;)
as a whole, there were definite ups and downs - there are seasons that were at best "meh". fortunately, there were great arcs (like the various relationships between characters, the whole genetic manipulation thing that went and jumped into the enterprise arc), and these kept the show going. and definitely, ending it at season seven was, as they say, a good thing.