I was so impressed by how Venditti wrapped up the series (due for cancellation when he took over) that I am giving this volume 4 stars. Overall though, with all of its ups and downs, it might be closer to 3.
Fight for Avalon (13 - 15)
Frankly, the first 3 issues here should have been collected with the previous volume. Not only they were written by Paul Cornell, but they also contained the -not so- grand conclusion to the 15 issues that he's written.
The conclusion to Paul Cornell's run begins by showing how each of the knights is doing in hell after Etrigan's treason. But as disturbing as it is to force Ystin to choose her sex by marrying a demon or to serve Al-Jabr only wine to quench his thirst when his religion forbids it, it is all really a bad joke compared to what you would imagine hell to be like.
That is because the ruler of hell, Lucifer, isn't any sillier: a character whose every line must contain the word 'entertainment' like a super-powerful man-child, which leaves you without a single decent villain in the series other than Etrigan, who, ironically, is supposed to be the series' main protagonist.
Paul Cornell's run concludes with a series of double crossings that puts Mission Impossible 1 to shame and leaves you staring idly at a huge battle that includes every single character in the previous 14 issues, with no reason for half of them to be there.
The Rest
Set 30 years after the events on the previous issue, Cain's army of vampires begins its invasion of Europe. Al-Jabr, now the ruler of a great city and the only member of the group who has aged during this time, reassembles the team to fight against Cain.
One of my biggest criticisms of Cornell's run was that he failed to provide a reason for these people to unite. Venditti managed to reunite the group in a very believable way, starting with Al-Jabr's call to the most virtuous of them to defend his city and ending with Vandal Savage accidentally facing Cain while attempting to attack the Demon Knights!
Even though I loved the team's members ever since the series debut, Cornell was not nearly as successful as Venditti in showing their individuality. In a way, Al-Jabr replaces merlin as the group's wise advisor, Vandal's whimsical nature is pushed to its limits, making him more a villain than a hero towards the end, and Jason's personality begins to mature, giving him a lot more weight even without calling Etrigan.
With the cancellation announced, it is clear that the series was wrapped up rather hastily, with the fight against Cain leading clumsily to the discovery of the Holy Grail's whereabouts. However, I was very impressed with the way Venditti handled the story, utilizing a few plot devices from previous volumes to tie up all loose ends.
Although I find it hard to recommend this series overall, I think it would be a great waste if you made it this far and did not read its conclusion. If you weren't entertained by the previous volumes, then maybe skip Cornell's issues from this one, but certainly don't miss the rest.