Sexiest mech? Hmm, tough one...
Well i only like chicken-walkers so that cuts out quite a few mechs. I think it comes down to two mechs for me.
Catapult-K2 (Pre-barrel nerf).
A great looking mech that definitely has the best walking animation...like it is stalking prey. Before the PPC barrels were shrunk it also looked like it meant business
Raven-3L.
To me this mech is like the Apache Longbow. It looks weird but in a kind of good way...and it's full of tech
The only thing that spoils the Raven is actually piloting one. From the inside it's like a hovercraft, yet from the outside it bounces up and down like a psycho pigeon
But if the Stone Rhino was in game there would only be one right answer