My take (no spoilers)...
Watched this yesterday, pretty good overall, better then the second I thought but not as good as the first. Doesn't feel like an Ironman movie though, mainly cos it's not all about the suits in this film, this is more of a Tony Stark movie with appearances by Ironman
Good - Good storyline, Mark 42 suit concept is ill, final 15 minutes is amazing!
Bad - Noticeable plot holes and there's a twist with one of the bad guys which I thought was a fail.
Good ending to the trilogy overall and is wrapped up nicely at the end