Overall, this scenario was a complete waste of my time. I probably could have made it in twenty minutes if I had any reason to.
Playability: It's another one of those scenarios where you kill things until you get bored. Every time you kill something, you get even more insanely more powerful than the legions of enemies around you. If you were actually bored enough, you could kill everything on the map, running back to your monk now and then for healing. But you only have to survive twenty minutes to win. Another playability issue, this scenario would lag unbelievably on a slower computer.
Balance: There is no balance in this scenario. How to win: Load the scenario. Go do something else for twenty minutes. Come back. You win! Ten minutes in, you get a whole bunch of cavalary and another guy that isn't supposed to die, but that doesn't change anything. If you actually try to bring Gandalf out, he'll get killed instantly, so make sure you send the large amount of cavalry out first.
Creativity: There isn't much creativity required to recreate Helm's Deep. All the work was done by Tolkein. It may have been more creative if it was a good recreation, but I'd never have been able to tell this scenario was about Helm's Deep if I hadn't noticed the title.
Map Design: Basic grass is evident everywhere. There is no eyecandy to speak of. By my count, five terrains are used in this scenario: grass, shallow water, snow, shallows, and forest. Otherwise, a whole lot of cliffs are the mountains that surround the Deep. There are also some mountains too.
Story/Instructions: Misspellng is rampant, impressive considering the lack of text. Several of the player names are misspelled. The short instructions and hints at least get the point across, but it took me a while to figure out that you had to figure out what do to in game without any chat.
Other things that bothered me: A player is defeated at the start. The objects being created and destroyed to count your kills are killed, not removed. The computer doesn't actually attack you. There are loads of unnessesary buildings and units all over the map. The units are renamed when you click on them, not at the start of the game.
I would not reccomend downloading this scenario. Just go place 500 champions on the map and give yourself 9999 attack and 9999 hitpoints, and have fun killing them.