More efficient? No. You mean stufftier. 700 triangles is very little to work with. You can only do so much with such a small amount of geometry.
No, I definitely mean more efficient, A+ for trying though. You don't know the term? You're right, you CAN only do so much with a small amount of geometry, but efficient modelers can do a good job at it.
Besides. Nowadays games arent supposed to look low-poly. Note how Garry's Mod used over 7000 triangles for the loving toolgun. I dont care if Blockland is a lego game, that doesnt mean that I have to use a measly 700 faces in order for it to look good.
You're trying to use the source engine as a comparison against an early version of torque, I shouldn't have to explain why that doesn't work.
This is all constructive criticism, so don't get so heated buddy. I'm not saying you're a bad modeler, you're just by no means good at being efficient with your work.