One of the things that I want to comment on is the fact that the last two series, Series 4 and 5, actually felt like one large 13-episode run of the show, and to be honest, it showed and amply demonstrated many of the highs and lows and the good and the bad of the show. With only James Lester, Connor Temple, Abby Maitland, and Captain Becker back from Series 3, and the introduction of a series of new characters - Matt Anderson, Jess Parker, Emily Merchant, and Philip Burton - in Series 4 and continuing through Series 5, a lot of fans of Primeval may have felt something of a disconnect with the show, and they would certainly have been justified in doing so. But the two series of the programme really did have a remarkably solid feel for the most part, and the overall plot of the two series went a long way to explaining a few things about Anomalies.
If I am somewhat discontent with the end of Series 5, it is due to the fact that while the immediate problems of Connor and Burton's work were resolved, sooooooo many questions were raised, notably "But what happens now????", as well as the moment right at the end with our leading man that makes one go, "Oh my Goddess, what's *this* all about????". The problem is that since the Series 5 stuff hasn't aired on ITV as yet (it only aired on Watch this summer, to a very limited audience, although the viewing figures for Watch have to be considered good, given the network), Primeval hasn't been renewed for a sixth series yet, and may never be (though there is the new Primeval: New World being made in North America). If it isn't, we may never learn the implications and ramifications for all the stuff that occurred in the last ten minutes of the Series 5 finale, unless these are somehow put into the new North American series.
That said, Primeval Series 5 was a pretty good ride, with some ups and downs, that gave us an interesting overall arc (no pun intended), some good and bad moments, and a story finale that raised more issues than anything else, and may have changed the landscape of the series completely. Whether we, the fans, get any satisfaction and manage to see more of this ongoing evolution of the Anomalies and their effect on the lives of modern man remains to be seen. And I really hope the series gets renewed for a sixth go around.