Well, unless you only count huge critters as game, then yes I have cleaned plenty of game with a Victorinox. Squirrels, rabbits, birds, fish, frogs, etc. I would even venture to say that I could skin a deer just fine with a SAK (granted it would take a bit longer) even though I have two Buck skinning knives for that purpose. I've hacked and whacked plenty of vines and briars as well. I'd much rather have a nice machete on hand as any large growth of briars will grab you pretty quickly if you use a small pocket knife on it (regardless of the brand of small folder). As far as cutting limbs and such, I'd put a Victorinox saw up against any tactical folder you like - a nice full sized bow saw beats them all of course, but I have sawed many a decent sized limb and sapling with a SAK while camping and making dirtbike trails and such. I think that a SAK will hold its own with any make of knife of comparative size. In other words a SAK isn't going to chop down a tree that you need an axe or hatchet for, but neither would a similiar sized Case, Queen, Schrade, super duper ninja folder, etc.
Bottom Line: If I'm going trail blazing, I take a large sheath knife or a machete. If I'm cutting limbs and branches, I take a saw or machete. If I plan on skinning large critters, I take a skinning knife. But, have I used a SAK to do all of those tasks before, most definitely yes I have, and yes I use a SAK on a daily basis.