I have watched both series and in contrast with Torchwood (which has gone from bad to almosy half-decent-ish - just feel that enthusiasm!), Primeval seems to have stood still, if not deteriorated.
It is irritating enough for the ex-student with hormones, but no sense, to walk backwards into harm's way, but do any of the characters hold on to their guns for more than a few minutes?
It seems such a shame that this programme is so let down by its script and the way it presents its characters. The concept is an intriguing one and we have not had to endure long explanations** of what is happening (which is a big plus in my book). It is also good that the world is not saved by a character who can sort it all out in two minutes while mouthing a load of less than convincing pseudo-techno-babble.
** - The way the wife/ex-wife (I don't the legal position here) seems to be able to move around, while the others just sit and wait, is a good example. It just happens (and if I did not have so many doubt about the scriptwriters, I'd be happy to assume there's already an unspoken explanation for this).