I also like Cornwell, but I have found him after a while to become a bore.
I read the grail quest, first book was excellent, but it went down hill quickly then, the final book in the series, was dire - imho
I also have the current series, about Alfred, which so far i am enjoying. Only time will tell.
However, back to Caesar, I appreciate that this is pure fiction, but I must admit I am enjoying them, and to be honest, thats all that matters. Once I have completed them, I get get the correct historical stuff, Caesars own.........