Depends on how it ended up.
- If the rubber arms were like DX 09 Keaton Batman, Hulk, Original Costume Batman, Hell Boy etc. I'd be fine with rubber arms. They haven't proven to be a problem. As much as I don't like rubber, aesthetically it does look better and more realistic. If it's a situation like ED-209 #1, DX 02 Batman, the Comedian, the Mars Attacks Martians, ED-209 #2, etc. however, then forget it.
- Single jointed, I don't mind. I never had any problems with the MMS 117 and Tech Noir Arnold figures (even though I would have preferred double joints so I could pose the shot gun over the shoulder). They were fine. The thing that was nice about them was that they weren't distracting, had movement and were free of any QC concerns.
- Double jointed? I'd be lying if I said I didn't enjoy that extra amount of movement in the arms. Sure, it looks pretty awful when the figure has bare arms, but the movement and realism you get for posing is unsurpassed.
Each have their pros and cons. If there was a guarantee that there wouldn't be a problem with rubber arms, rubber would be the most realistic option. Perfect if you don't plan on any extreme poses and are fine with a museum style stance. Single jointed elbows are the happy middle ground between aesthetics and movement. Double jointed is great for fully clothed figures and maximum movement.
I dunno