Ermm, a few things:
1. If it was made from cast or machined alloy, it would cost $$$ to produce given its complicated 3D shape.
2. The little 'grooves' are on top of the air intake, then wouldnt make the slightest difference to cooling; the blower is designed to act as a shroud around the motor so that the air is forced down through the cooling fins built into the motor itself, then exit at the bottom where the shroud stops.
3. Thats a CAD rendering of the design, it isnt ment to be photo realistic nor show the material, its just a picture to show what it looks like.
4. You have a valid point about the power wires being too short, though a .50cent rx extension lead, or .05cents worth of old wire could be used to extend them as required (welcome to the wonderful world of hobby grade r/c; customization and problem solving skills required...).
5. If you did a little research before ordering, or just asked even, then on page 3 of this 6 page thread, you would have seen a full review, including photos and a detailed description. Or you could have asked Castle via phone or email.
Sorry you feel robbed, but its a $12 fan & shroud that cools your motor a bit, not a liquid nitrogen cooling rig- it still works doesnt it? If it were broken or didnt make any difference to your temps, then you could complain...