Have you ever slipped on a nut and stripped the pliers teeth? Or dented the wire cutters cutting something hard? How do the screw drivers hold up? Knives worn out of chipped? Anything you dont like?
I've had all the better quality tools (and not so quality) at one time or another. Each brand brings to the table a strong feature. Meaning each tool has good features as well as bad. ex: (for me) Leatherman has the best plier jaws but Gerber's jaws open wider but the tips are more blunt.(get it?) I think anyone that uses a multi probably feels the same way.
Up until my Swisstool Sprit, I would have had to say that Leatherman was the best all around tool. Now, I say Swisstool Sprit is hands down the best all around multi-tool I've ever had.
To answer your questions, 1- I've used my jaws pretty hard on nuts, round stock (small pipe nipples, etc.) with no damage. I would not say I was extremly hard on them though.
2- I've not dented these cutters yet, but I don't cut real hard stuff with them either. I have dented the larger Swisstool's cutter though.
3-The screwdrivers (esp. phillips) have held up well and see a lot of use. Other brands, except very cheap ones, have held up just as well.
4- The knife blade doesn't see much action as I carry a folder (or two

) along with this tool. The blade has opened some cardboard boxes (like a hot water heater comes in) and had done a fine job. I've carried this tool almost two years and that is a testiment to this product. (meaning I've never carried any one thing this long and don't plan on changing to anything else).
5- there's nothing I really don't like. Everything seems to work fine. The wire cutters could be a little longer and the file works about the same on both sides.(most have a "wood" side and a "metal" side). That's all I can think of at this time.
Tools I'm compairing it to. Leatherman: Supertool, Supertool 200, Old style Wave, original Leatherman, Blast x 3 (liked that one), PSTII. Gerber: Old style pinch your fingers tool non locking blades (600?), newer one with locking blades(600?), Deisel, the W-mart closeout special (version of 600). Kershaw with the vise grip jaws. Klein's. Swisstool, the large one. SOG powerpliers, Paratool. There's more but I'm an old man and can't think of the rest.
Hope this helps you somehow.