'Expend4bles' is a mixed bag. I was never entertained, though I was also never all that bored - odd.
I think it's ever so slightly watchable because of those who are in it, given they all fit their roles to the T. However, I can't class it as anything 'good' because the sole job of these films is to be entertaining - and this just isn't, even if I wasn't necessarily craving the end credits. It's all simply rather dull.
Jason Statham and Sylvester Stallone (who is strangely, given he is the series' star, sidelined) are a solid pairing, while Megan Fox does quite well throughout - her best performance that I've seen, admittedly I haven't yet checked out anything with her in a lead role; 'Transformers' (meh) aside. Andy García, meanwhile, is alright, the best of the rest if I was forced to pick one of 'em.
I'm kinda surprised this franchise even got a fourth entry, since its release I kept forgetting it even existed... and sadly, post-watch, I don't see that changing. Weakest of the tetralogy, for me.