Panzer, LAW, and the Lake weren't that bad. War Machine and the ones I just mentioned are also pretty solid when PaP'ed (PHD makes them all the more better...). Springfield and SMR though... ugh.

Well, for World at War, it was seen as a troll, because you moved so slow, you could possibly down yourself by shooting it at a zombie, and the lake is a troll gun, although with PHD it's fine, but before PHD, in maps like Kino and Five, it was a Troll. The LAW is like the Panzer with how it worked, except, as you mentioned, PHD could remedy it.  And the war machine is still a troll weapon, until PAP'ed, as you mentioned.
So, long story short, these guns are trolly until PAP'ed, except the Springfield and SMR (although the Scoped Springfield in SOTDO was pretty beastly)

a weapon thats powerful but a risk to use is not a "troll" it requires "skill and strategy"

can we stop throwing the term "troll" around like it applies to anything with a negative side...