Marlin has an option for folks that don't like 24" barrels on their leverguns - the blue/walnut version with a 22" barrel. The difference beteeen a 20" and 22" barrel is pretty minimal. Not that it matters to me as I have leverguns with barrels from 18" to 22" and really like the feel of the Marlin Cowboys with their 26" barrels.
I've had an opportunity now to handle a .45-70 Guide Gun and .30-30 XLR side by side on a couple of occasions now, and have to say I like the feel of the XLR every bit as well. I also scope my Marlins, albeit in Warne Quick Detach rings so I can shoot iron sights when I choose, and like totallycustom hunt out west where I can be in thick timber one minute and looking at a lot of open country the next. I like my .30-30, but I'm not going to take a poke at an elk at 300 with it. The .308 Marlin changes the equation and a 300 yard poke is a reasonable even with handloads that don't quite match the velocity or trajectory of factory ammo.
OK, the 24" XLR is not a traditional configuration for a "brush gun". People bitch about the barrel length, the laminate stocks, the stainless metal and even the cartridge. To which I say, if you don't like it, don't get one! I have enough walnut/blue, short barrel leverguns in the safe and welcome the both the XLR platform and the .308 Marlin cartridge.