The triggers on most of the two trigger shotguns could have been set up to suit a left hander.It just takes a competant gunsmith and a bit of time.
The pump action Taurus firearms all seem to have some problems and there is not enough value in them to spend a lot of money mucking about.The Petersoli in 44.40 and the USFA in 44.40 at $A2000 and $A3000 respectively are not a great deal better.However I will continue to work on the USFA till I get it right.
Your 1894 Marlin should not cause any problems till about 5-10,000 rounds and then parts are showing wear, and you will be subjected to "Marlin Jam". Its fixable, and should not occur again after the correct fix.
All were designed two centuries ago to be shot when needed, and in 2008 we drive them like a race car.