With the Citadel on the verge of a catastrophic meltdown, Barney and Gordon Freeman are trying to escape City 17 when their plans take an unexpected detour.
I agree with some others here.
There's nothing original at all going on in this mod. Basically they've re-created HL2 Episode 1 and simply re-arranged the elements.
Hell, they've even used the same puzzles which is really silly. What's the point in adding a puzzle that everyone knows the solution to? They've already completed these puzzles in HL2 Ep1. I get the feeling they added the puzzles just because they thought they should have puzzles in their mod but never bothered to sit down and actually think about creating anything new.
The score of 5 is for the mapping work. It looks good.
But all this good mapping work is utterly wasted on a lazy effort at gameplay.
What a shame...