Hello...no poll this time

Is it me being a dumb ass or I feel that the computaion for weapon damge for D3 is utterly confusing. For eg, say

Weapon: 100 dps
Range from 50-150.
+min 20
+max 20
+50-150 Holy Damage
+ 33% damage

Now normally, we just see the dps and we take the figure. Is DPS accurate, be all end all? I guess the DPS is the average from the weapon damage range ie 50-150.
However, what confuse me is the + affixes. I mean from the eg above +20 min or plus 20 max will it push the range to 70-170? Or it is already included in the stats of 50-150?
Also, +50-150 Holy damage...does it mean it will give additional damage, say making total range of 100-300 (being physical damge 50-150 plus 50+150).
Lastly, +33% damage, is it 33% extra damage after adding all damage, or the extra 33% damage is built in the weapon already. Eg you get extra 33% from the 100-300 or actually the 33% is included in the 50-150 damage?

I am confused....any sifu can help?

In before just take the DPS and forget about the rest!!

Ah..then Blizzy should just do away with all those dumb + affixes. Just put DPS ..settled. No need to put +50% damage la or +500-1000 Fire damage to impress/konfuse people