Beta 4 is the first version of the map that I looked at and it reminds me a lot of my first map I ever released, Mad Dash.
Basically, the problem is this: The map is a straight line, so no matter how cool you make your low, it will not be used. And no matter how much you dress up the top with barrels and hay and boxes, it will still be a 3 seconds down and back cap combined with a line fest. Looking at this version, and then seeing the old pictures makes me believe you have gotten much better at mapping then when you started. I think you should put your talents into making a new map, one with some cool strategic layouts.
I do not want this coming off as a "raging" because I am actually giving you a compliment. Your abilities surpass this map, so make a new one
-Cusoman