To be honest I wasn't expecting that much from it as I thought the rest of the series was slow moving and completely irrelevant to the big picture however the last episode was amazing. It has left Torchwood open for another series which could include Rex. It also closed some loose ends however left the series on a big cliff hanger.
Anyway, what I was saying earlier about how some episodes have been completely irrelevant in the bigger picture, the 2nd episode was unessential. It also had nothing to do with anything, also that episode with Angelo. Apparently he knew something about the miracle, he didn't tell us anything.
All in all though it has been a good series and I hope they do another one. If they do though they should format it like series 1&2, so instead of having 10 episodes with the same story line they have 13 separate episodes about different stuff. Also, please get the original Torchwood theme tune back!