
How a fight involving a Machinist would occur depends on the specific rules of that instance, too. If this isn't for self-defense (a simple sparring match, for example), weapons and magic may just not be allowed. So you wouldn't even have to worry about it. As for a life or death situation, or if weapons are being used for sparring (perhaps with paintballs or just aether?)...
Purely going off of in-game animations, Machinist doesn't seem like it's some Western rapid fire, bullet hell-esque type of shooter. Its gun is more akin to a hand cannon if anything -- that is to say it fires shots kind of slow. It's not a gatling gun. (You could blame this solely on the GCD, perhaps. But story NPCs are typically careful with their shots as well.) This provides enough room for error, enough time to dodge, or to have something external ruin their focus.
In short, as others said, get creative. If people could have decent combat RP in other MMOs with guns & magic, it should be fine here, too... Provided the people involved collaborate well.
Purely going off of in-game animations, Machinist doesn't seem like it's some Western rapid fire, bullet hell-esque type of shooter. Its gun is more akin to a hand cannon if anything -- that is to say it fires shots kind of slow. It's not a gatling gun. (You could blame this solely on the GCD, perhaps. But story NPCs are typically careful with their shots as well.) This provides enough room for error, enough time to dodge, or to have something external ruin their focus.
In short, as others said, get creative. If people could have decent combat RP in other MMOs with guns & magic, it should be fine here, too... Provided the people involved collaborate well.