Guys,
Here's what started all this. On the MJ12 website, Defiance page, there's a PDF file you can download called “Demo Army Lists.pdf”. The 3rd army in that document is called Space Thugs which is another way of saying Orks.
I was making up some units the other night for the figures I already have and came up with this.
Basic Thug (Ork) Unit
405 points (10 figures x [17 per figure +20 per weapon] +35 level 1 leader)
Minimum Unit Size = 4 (5 for regular quality -1 for leader)
Mob Thug (Ork) Unit with Unit Banner
855 points ((20 figures x [17 per figure +20 per weapon] +35 level 1 leader +80 unit banner)
Minimum Unit Size = 3 (5 for regular quality – 2 for unit banner)
The only reason I took the leader in the mob unit was so I could take the unit banner.
Now, what's a better deal, 2 basic Ork units or 1 large Ork mob?
2 Basic Ork Units, 810 points, and combined the units can lose 12 figures before they have to start taking unit morale tests. This assumes the leaders are still alive.
Mob Ork Unit, 855 points, and it can lose 17 figures before it has to start taking a unit morale test. This assumes the banner bearer is still alive. That's 5 more figures to lose for the price of about 1 extra figure.
The unit banner -2 minimum size modifier for mobs just seems like it makes difficult units even harder to break. The mob without a banner already has more figures to lose than 2 basic units; this just allows mobs to lose even more.
However, upon further consideration I don't think I'll ever use a unit banner with a mob. It's more cost effective to just purchase 20 Orks for 740 points and not include a leader or unit banner. This unit can lose 15 figures before it has to start taking unit morale tests and costs 70 points less than the two basic Ork units which can only lose 12 figures. The extra points can then be used to purchase support weapons instead which will put the basic units at an even bigger disadvantage.
Now that I see how expensive it is to purchase a leader & unit banner for a mob, I agree with the rules as written. It should be -2 for a mob. It's not normally a good points cost decision but if you want to do it the -2 at least makes it somewhat beneficial.
Kyle