Historically Inaccurate and Really Quite Stupid Anyone who is even remotely familiar with what is known about EL Cid knows that the writers spun this series out of whole cloth and didn't even bother to review the historical sources, the few there are, or, if they did, decided to totally ignore them. The actual history is complex but the writers decided to invent a something complex but totally unbelievable.
The actor chosen to portray El Cid, the greatest warrior of his time, is head and shoulders shorter than the other actors and we are supposed to believe that he is the most formidable warrior of his time and can defeat other warriors in hand to hand combat where size and sheer strength are the most important, if not determining, factors.
This was an expensive series to make considering the sets and the battle scenes are expensively done, if rather ludicrous from an historical standpoint. In one scene King Sancho's army is ambushed in his brother's territory by cavalry that has them trapped on two sides of a road passing through low ground. Apparently, the King and El Cid (the greatest general of his time) are so militarily stupid that they didn't send out scouts, in enemy territory, to see what dangers are out there and are surprised when ambushed in broad daylight.
The stupid factor trumps any enjoyment.