I completely agree that fun is better when its balanced. I'm just trying to convey a point :P
Always critting below 25% I reckon would be pretty cool, 10% would be pretty much dead with a normal shot I would think. I agree with what a lot of other people have said already, generic +stats on items is really boring. It could be a whole lot better. I just want the devs to look at the items and not feel restricted by exact balance, because its not really necessary. Adding fun effects would be great, if it had a cost to the effect so it balanced out, that's even better imo.
Eg, Ice Cape, sends out a frost nova on taking damage that snares enemies in blast radius but lowers total movespeed by 50% because you're always so cold. Or you could permanently have the chilled status effect. OR the frost-nova effects allies AND enemies, so it will punish poor positioning.
There are definitely ways to add awesome effects to items to spice things up!
Another example would be:
Shield: Blocks all arrows, but takes 150% damage from melee attackers.
Amulate: Applies cursed debuff. Blocks the first hard CC your character would be disabled by, once a CC has been blocked, Cursed debuff is lifted until the end of combat.