BattleTech: 'Our 'mechs are walking tanks against a backdrop of noble, warring houses across the stars'.
Robotech: 'Our 'mechs are derived from alien technology, and only they can save mankind'.
Fighting Fantasy: 'Our 'mechs herd fricking dinosaurs! SUCK ON IT!'
Who doesn't want to roleplay in a setting like this? Fighting Fantasy rules on so many levels it's not funny. Every one of their gamebooks makes a great source for material; settings, encounters and ideas. You may not like the system, but some of the campaign ideas are just excellent.
Above all that - piloting giant robots to control great big herds of dinosaurs. Epic.