My pushback is around (what seems like) the loss of individual player agency over one's character in such a scene.
Sure, the one player pulls a gun - but what do the rest get to do other than accept as a group whatever outcome (good, bad, or neutral) that action leads to? Does my PC get a chance to try to stop him, or try to flee, or to pull my own gun*, or do anything else independent of what he's doing?
* - and if so, do I get to decide whether to point it at my friend and try to get him to stand down (which would probably score me a brownie point or two with those we're dealing with!), or is that off the table?
I guess I need you to define your view of "un-fun" here as otherwise I'm not sure what you mean. No player likes having their PC captured - it's a Bad Thing, and those are rarely if ever fun at the time though they're often memorable later - and some players would even rather send their character out in a "death before capture" blaze of glory. It's their choice, isn't it?
Until we agree on a definition of fun, whether it's more fun is an open question. What it clearly is is more time-efficient at the table, but is the loss of player agency really worth it?