Torchwood

I started to watch Torchwood since last year because I'm a huge fan of Doctor Who. I really enjoyed 1st and 2nd series. It's like Doctor Who for adults, there are a lot of sexual and violent scenes but each character is unique and I liked the storyline as well.
However I was bored with after 3rd series. I came up with some reason. Too much characters are dead. Owen is dead, Toshi is dead, and Ianto is dead!!! Main characters death is dramatic but this is too much.

And the theme become too cosmic, there are more scenes which I feel they should call the Doctor. Considering that fact, Alien appearances and time travel scenes are decreased.

And it's a little bit Americanized after 4th series. Although I like British style...

Is there a 5th series? or collaboration with 11th Doctor? I hope It'll get better.