8/10 for me.
Some jokes were great, some swung and missed
The action was very good, there were some nice inventive moments in there; though one more set piece to broaden the scope would've been nice. Having read the original script, I thought the third act was a little bit of a let down compared to the third act in the script, but I guess budget constraints played a not-small part in that.
Great performances all around, Reynolds, Baccarin, Miller and Hildebrand were all perfect in the roles, and even Skrein and Carano for being mindless henchman types did just fine, nothing special but they did their best with what was in the script/budget (though I agree they should have teased someone above Ajax, either Killebrew or maybe Sinister..?)
So yeah, I don't have much to add that hasn't been said.. It was far from a perfect movie, the plot was very paint-by-numbers, but it was a lot of fun with a great, source-accurate representation of the Merc