G-man man is asking you for another mission at Xen, this game is kinda difficult until you realise it. =P
The most remarkable thing of Absolute Redemption is the try to make a spin-off of HL1 and the creative areas like the Himalaya and the Amusement Park. The design of the mod in general has positive things and bad ones, like the monotonous environment in the warehouse and not very well made modelling in several places. Has a something engaging story, but because the maps has so many dead ends (so long that they even need a loading screen) I quickly lost interest.
In fact, suddenly in the warehouse part, I was desperate to end the mod in a piece.
As for the length, it was good enough, but because of the dead ends and the long scenes it seems it has maladroit ways of making the mod long. The gameplay has less action than Half-Life, something that really hurts the experience considering this is a spin-off of HL. I don't recommend Absolute Redemption at all, but on the other hand, it's a classic. I leave it up to you...