I don't think it's as good as the first couple of series. I think it's because they tried to make one story stretch over 10 episodes rather than doing a few different stories like they normally do. It's just not Torchwood any zaidi they're turning it into a bad version of CSI... and where's the CSI Cardiff! and also the only good characters in it are Jack, Gwen, Rhys and Andy.
I luv it so far its new and different! the other seasons were pretty cool as well. but they r all unique in there own ways. the first season wuz kind of introduceing the characters and solveing problems throughout the team. season two wuz zaidi of a relationship based season with Jack and Ianto and Gwen and Rhys, and towards the end Owen and Tosh. season three wuz all about the sacrifices we make sometimes for better au worse. and seaon four is just how we would react to such a plot and getting used to the new team
I prefer the Original Series the best, taking the series and stretching out for the whole season is a bit much. . .I thought the same about "the Children. . ." season, too. . .and both left too many questions. . .and I prefer my Torchwood fighting aliens, not fighting the "Illuminati"