I've heard lots of folks bashing the "new" marlins, never owned one so I can't join in yay or nay... The older ones that were sold at wal-mart were the model 30aw or something like that, I currently own one of those and it is a fine rifle, the only difference is the front sight, it is a blade/bead rather than a shrouded ramp. I must say, I personally like the blade/bead more, it's easier for my eyes to put a tight sight picture with it. Of course if you're planning to mount a scope, then that is a mute point other than asthetics... The shroud/ramp is nicer looking... Oh, and rumor is, the stock is made from a lesser grade of wood as well...
I like my 30aw just fine though, i replaced a 1965 model 336 with this one, I liked the old 336 just fine, but I must say, this newer one with the safety, I like it more. The safety is kinda redundant on a levergun with a half-cock anyhow, but when unloading after a hunt it sure is nice to put that safety on while you lever out a tube full of ammo...