They've all got a bullseye on their foreheads, though,
Hormiga--as Ianto pointed out in 2.03, everybody dies young in Torchwood.
The weevils attacking the four senior-most officers seems deliberate and part of Gray's (Grey's?) plan, but as for the other stuff--the alien in the hospital that Owen deals with seems mostly harmless, and it's not hard to deal with those cloaked figures in the central server building. So I was wondering if maybe John threw in a few little 'extras' when he was implementing Gray's plan--by sending the Torchwood team out like that, he got them separated from Jack (which I'm sure was Gray's plan), but he also put the team where they needed to be when things went bad: the hospital, the police station and the central server. So it might have been his way of 'helping' them out without raising red flags for Gray.
Also, I keep going back and forth about the fact that John did whatever Gray told him to because of the bomb. He destroyed Cardiff and killed who knows how many people to save his own skin--and yet, I can't help but wonder how much it would have helped if he hadn't gone along with it. Assuming that Gray sent him to Cardiff against his will, if he didn't do what he was told and the bomb on his arm was detonated, there would still be damage and carnage. Also, Gray would still go after Jack regardless--and John
did ultimately help Jack and the rest of the team. They wouldn't have known what was going on with the city crippled the way it was and the team separated...
I like the idea that John's love for Jack was enough to make him do the right thing (for the most part). I'd love to see him more next season. I'm not sure what we have in store as far as the team goes or anything like that, but having John back a few times would be cool--especially if he and Ianto are snarky with each other.
I love Tosh, and I'm going to miss her and Owen, but I'm still interested to see where the show goes from here.