The harshest reviews here have been by people criticizing the series historical inaccuracies, but all I know about the discovery of King Tut's tomb I know from a little light reading after watching the series, so I really don't care if there were no Rolls Royce's in Egypt at the time.
But purely as a historical drama, the series isn't especially well constructed. I don't mind the romance between Carter and Lady Evelyn because it most likely never happened but rather because it overshadows the actual story of the tomb. The problem is that the script never makes me care about that relationship, yet focuses on it so much that I feel the science is completely underserved.
I was also a little bothered by the portrayal of the Egyptian government as officious, soulless bureaucrats. I'm not saying they weren't, but I think the history of Egypt, Britain, and artifacts is a rather complicated one and this strikes me as a simplistic approach.
Overall, this feels like a script written by someone who wasn't convinced that Carter's discovery of the Tomb was particularly compelling, and thus ginned it up with romance and conflict and attempted to shape it into a conventional and fairly forgettable little drama.
On the other hand, the story is scenic, the actors are likable, there are good moments, and overall the series kept me entertained until it fizzled at the end.