Concerning how good or bad scissors may cut - we have 2 medium sized scissors at home. One rather old (for hairdressers I guess) and one new (German).
The old scissors have the blades loose, but the blades are slightly curved so as you cut they touch ONLY at the point where the cutting takes place. This also means they do not tend to 'clamp' the material being cut. The fact that they are loose does not matter - the way one moves his hand during cutting pushes the blades towards each other and they cut fine. True is - this scissors would not work well in left hand.
The new scissors are much more 'stiff' - the blades are straight and completely flat - so they touch each other over a large area while cutting and give some resistance (because of the constant pressure the blades are pushed against each other). If I would cut a scotch tape with them and get a bit of the glue on the inner side of the blades the scissors get nearly unusable because of sticking.
I much prefer the old one eve though the new is technically sharper