Just finished watching the final episode of Six Feet Under. Don't worry, there's no spoilers here in case you've got it TiVoed for later viewing. The show ended in a good way, I think, a sad happy ending true to the show's focus. Poignant, I think they call it. SFU always did poignancy rather well in a medium possessing little patience for it. Many people will probably disagree that it ended well, that it wasn't Six Feet Under enough for them, but it's difficult to do a "normal" show as a finale; that approach would have failed in a different way.
But what do I know? I've seen every single episode of the show, many of them twice, and at this point I'm not sure how much objectivity I have in talking about it. Somewhere along the way, Six Feet Under became a soap opera for me. In many ways, this is the viewer's goal in seeking out entertainment, to stop the analysis of everything and just let go and enjoy the experience. To relax. As some have argued, the show may have gone downhill after the first two seasons, but I don't regret not noticing those flaws and just enjoying the ride.