I played and enjoyed a lot of this, but when I got to the gigantic fight with all the spawning monsters I admit I sighed inwardly. I just don't enjoy these things, being much more of an explorer than fighter. What to do, then? Keep trying over and over, not really having fun, and learning to dislike the map? god-mode my way through and call it done? In the end I did neither: I just walked away, with happier memories of the early part of the map.
I won't award a score, as it would be unfair in a map that I didn't complete.
(To be clear: I don't think the Big Arena Fight is an unreasonable choice for a map designer to make. It's just not one that interests me; but I know plenty of other people love this kind of thing, and good luck to them.)