As Bart Simpson said... 'meh'.
While I didn't like it at first, I have to admit that I'm not sure it wasn't the best choice available. Short of actually killing Tony, there is no real resolution to the show. This ending will be talked about, probably more so than any other choice.
The high point of the episode was Tony's musical selection of course, Journey. I always find that the music in a show or movie can have a huge impact on my lasting interest. Some of my favorite (and most watchable movies) are as much for the music and immersion as for the actual content. This also holds true for the greatest series finale ever.... Six Feet Under
The gold standard for series finales is still Six Feet Under. There is no other more appropriate satisfying, and 'true to the series' finale. The last 5 minutes of that finale were phenomenal.
Next up, The Shield series finale.
Edit (6/13): Here is the last 6 minutes of the Six Feet Under finale.