While edge highlighting is fine, it can also be interesting to sometimes tone it down or up, and not keep it equal everywhere. I think there's a danger in accentuating the edges too much. This isn't necessarily done with edge highlights alone, it can also be done by adding details which conform too much to the quad/poly. Some texture artists just add an embossed bevel inside every quad to make 'techy panel stuff'.
I think textures should make it seem like there's more geometry, or in some cases, by skipping an edge you can make things seem smoothly curved. Maybe the chest of this thing could benefit from that.
If you have the Q3A textures, it could be interesting to look at TankJr. It does do the inset quad aligned detail here and there though. Crash's helmet has some interesting shadow gradients going on rather than just edge highlights. My favorite texture is probably Major's. On her single player skin you can see the edge highlights for the worn metal, but on her team skins there's a nice smoothness going on.