I'm sure most of the loose joints could be rectified with a bit of nail polish or whatever. None of them are deal breakers. A few people are reporting issues with the left leg not extending fully after transformation.

The tabs are really hard to line up and push in, but mine is made harder by the ball joint wanting to pop out all the time. Once in gun mode he's pretty sturdy, although the weight of the silencer makes the muzzle prone to flopping.