The thread is about big game calibers, not just lever guns. If you want to shoot a lever gun, Browning makes a pretty darn good one in .308, 30-06, 7mm rem mag, etc., etc,... Never mind all the Savage 99s and Winchester 88s. Each and every one of these calibers is ballistically superior (ie. flatter shooting, harder hitting), than the 308 Marlin express. Plus in order to get the published velocities for the caliber, you've got to shoot the marlin in a 24" bbl configuration, which isn't very handy to lug around all day. The easier to feed part is due to the availability of 270, 308, 30-06 ammo anywhere. Good luck finding Leverevolution ammo at home hardware.
As I said in my post, if you love leverguns 'cause they're leverguns, get the marlin express, shoot it, and enjoy it. I love leverguns and have two marlins that are very nice to carry and shoot. But I accept their limitations as requiring flat nosed bullets and shoot within those limitations. However the 308 marlin express is being touted as flat shooting, high performance, when in fact it is inherently handicapped by only one bullet type (Leverevolution) and pressure limited by the the strength of the marlin action relative to a bolt action. Nothing wrong with the .307 either, but they are rare out here in the east

( I have only seen two), and are no longer manufactured. Clearly they didn't sell well. Not a good choice unless you are a fan of the caliber or a handloader.
I seriously doubt that a caliber which can only muster close to the performance of a 308 under optimal conditions in a 24" tube is going to set the world on fire, particularly when fed premium leverevolution ammo which is not universally available and impossible to duplicate due to no availability of components.