I believe all this conversation highly depends on how invested the player is. If you play 1-2 CQB games a month or maybe a field game, an ACM will do just fine. I won't pretend to be an expert but I do have over a dozen reflex/red dot ACM sights and they do vary in quality very much. For example, I have one Aimpoint JH400 replica shear the elevation screw as soon as I tried to adjust. I have another version that has a fuzzy reticle. One of the two Aimpoint Micro clones has such a large MOA and bloom that it couldn't be "2 MOA" as listed by the seller.
The rest have held "relative zero" well enough for my purposes. As long as you understand the limitations and are not having to live with it day in and day out, an inexpensive one will do. Seeing a little ghosting or my a bit of my own reflection is not a deal breaker for the recreationalist.
Lastly, I have reflex/red dot sights on all my rifles because I lend them to friends when we play. It's far easier for someone to "pickup and go" with a red dot than it is to teach them to sight irons -- especially since those folks might only play 2-3 times a year at best. An inexpensive (not crappy) red dot gives them a better generalized idea of where they are shooting and fun for those few hours.
So, different strokes for different folks. I'm not going to say inexpensive red dots are awesome (ugh, my first $20 NC Star really is crap), but it may be sufficient for one to enjoy the game. If and when you get serious, go ahead and invest in an optic on par with the price of your gun -- but I hazard a guess that many folks won't have the discipline/skill to shoot a consistent grouping for that to matter.
What I will say is this... I have a little bit more disposable income (or obsession) than most and hence have multiples of things (i.e. Gold Match, sights, rifles). If you choose to go the cheapie route, there is a much higher chance you could get one of those lemons (fuzzy reticle, broken screw). Still, with a decent seller you can have recourse if you have lots of time and patience.
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"...However, if preserving the integrity of the gun was the only factor at play then clearly the best option would be to run a 0.0v Lipo and run around shouting 'bang'."
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