I'd be less inclined to take them in that scenario. Mainstat is better than power on a 1:1 basis for all classes (within the current gearing range), so when someone augs for Power it's a sign they haven't done their homework well enough.

Lets do some homework shall we?

Let start with a lowish strength character say of stock unoptimized pure columi (say this one I posted here the other day):

http://swtor.askmrrobot.com/characte...4-5721e8ae4079
This one has power augments so lets work out the stats to see the damage (including crit) as one number vs the same build but with might augments. For simplicity sake I won't take accuracy into consideration but it wont affect the point I am going to make as I'm not adding any accuracy changes.

First up power:

Damage primary = 743.5 - 894.5 so mean average is 819

Damage secondary = 199.3 - 299 so avg is 249.15

Ignoring accuracy 819 + 249.5 = 1068.5 this is average normal weapon damage

So lets work out the crit for that:

70.81 % (surge) will be added to that at 32.98 % of the time so 768.28 32.98% of the time is 253.37.

So 253.37 crit plus 1068.5 normal weapon damage =

**1321.87** average melee damage

Next strength:

http://swtor.askmrrobot.com/characte...7-ebd3e41c276f
Damage primary = 738.2 - 889.2 so mean average is 813.8

Damage secondary = 199.3 - 299 so avg is 249.15

Ignoring accuracy 813.8 + 249.5 = 1063.3 this is average normal weapon damage

So lets work out the crit for that:

70.81 % (surge) will be added to that at 34.35 % of the time so 752.92 34.35% of the time is 258.63.

So 258.63 crit plus 1063.3 normal weapon damage =

**1321.93 average melee damage**
You might be thinking I just proved you right (just by 0.06 damage), but don't forget this was based off a columi character who start off with lower stats ceiling from the offset, what about someone in optimized rakata and above who are most probably already stacking enough crit? Is the extra main stat then really worth the risk of diminishing returns where you'll be losing a lot more than a small number like 0.06?