There are some things I really like about divinity's levelling system in general: the complete freedom you get in building your characters.
However, as it was noted before, the exponential curve in the strength differences between levels is somewhat offputting and just doesn't feel natural, I competely agree. Especially as it forces you to spend hours and hours of stealing and shopping for your whole party -- and this, especially in MP is extremely boring and annoying right from the get go, as obviously only one person's character would specialize in bartering (.. Which ring d'ya want? The heinous one, third from the left? And which wand was it again? ...)
I really wish there was some way to either upgrade your items to your character level -- maybe with some crafting skills as it used to be in DOS1, or maybe develop some mechanism to level gear automatically. Especially as item stats seem to be completely random, so more often than not you will end up with some useless boni (who needs +STR and +INT on a FIN item??? Bonus to 2H on a 1H sword??? That just feels like trolling...)