I watched the entire series. I believe the first season is infinitely superior to the second one, but I like them both. It's a bit over the top at times in terms of drama, and they sometimes take (wild) liberties with -actual- historical records, but the overall ambiance of it all is top notch, to me at least. It mildly suffers from an excess in grittiness ("the more gritty it looks, the more historically accurate it appears", which is a fallacy. People have to be obsessed with sex, soldiers have to look like they haven't bathed for days, etc) that makes it less believable at times, but I nitpick.
Overall great series.