I actually enjoyed that episode a fair bit, but you can see that the show was really struggling for time. They left so much to do that they had to just cram things in. That was part of the problem with S3's finale - the ending was so abrupt. I believe they tried to give themselves some more leeway this time and had the main story done halfway through the episode.
The show has for a while veered into Tommy being Walter White v2, but I've accepted it for what it is. I was surprised by Arthur being dead though - they'd struggle next season with characters if he was gone. The MP/Politics story line next season I think I'll find far more interesting than this faux-Italian war they had, and if it is indeed the last season we could start to see characters dropping fast. Overall I enjoyed the season more than S3, but not as much as S1 and S2, mostly due to the Changretta threat being underwhelming in this one.