"Only for limited tactical use, a robot is incapable of holding a position. You can't win a war if you don't put your people on the ground to hold territory."
-Try looking at this from a logistical standpoint, humans require much more supplies and are more expensive force to maintain than robots. I think that everyone can agree that automation of most activities generally drives the cost down. Just a couple hints: What does it take to support a human day to day? What is the total cost of casualties? (think the valuation of a human life during wrongful death legal actions as a loss to GDP over time), What are the expected medical and disability claims for veterans? By keeping costs low, a force can be maintained for somewhat longer than it would be otherwise. Drones could switch to a low power state or wake intermittently, a situation in which very little supplies are used. In a situation where work that can be done by robots vs having a human do the task means that costs are reduced and thus a more effective force maintained.
"Drones also have the really bad side effect of causing colossal amounts of collateral damage and really angering civilian populations. Even the most successful strategies are of little value if you've turned the general population into enemies as opposed to neutral civilians. Neutral civilians being the largest group in any conflict."
-Humans are just as capable of making mistakes as drones (see apache helicopter kills journo on youtube), one could argue that being in the "heat of the moment" rather than disconnected makes for more rash judgement. Drones can afford the luxury to shoot LAST preventing collateral damage, humans cannot. Remember that guided munitions are a simple form of expendable drone, I don't think that anyone would argue the efficacy of these weapons vs the carpet style bombing reminiscent of the vietnam era especially when it comes to collateral.
"Organized military forces never do well against plain clothes enemies no matter their superior numbers or firepower."
-That is true to a point, but drones allow an organized force to do better than without them. The largest problem with "plain clothes" combatants is identifying combatants from civilians, drones are well suited to this with enough ARGUS-IS type drones and additional ground intelligence the process of identifying combatants could be greatly simplified. It is hard to argue that having less information is better.
I don't think that anyone imagines drones responsible every facet of warfare, but I do think that you would be hard pressed to say that having fewer options is a better prospect than having more options. Ultimately drones are just another option that can do a particular job more cheaply and safely than their human counterparts and that seems to be the VALUE of drones/robots. If you would like a real world example to the efficacy of modern developments you may compare the two afghan wars (soviet era and US) both around the same length, region, modern forces, time (happened just over one decade apart), vastly different collateral and causalities.