I really enjoyed it, but I think Mike's right that it's glib and doesn't quite earn it's bigger emotional moments.
However, it deserves to be seen and it deserves to be a hit.
By far the most entertaining of the DC superhero movies it's (not coincidentally) the funniest too. Nothing is allowed to cheapen the horror of war, the humour is carefully kept to scenes around the battle field, so that the laughs are counterpoint and often much needed.
Gadot owns the role, I have high hopes for 'Justice League' and I expect her to be a highlight there too.
Pine is clearly incapable of a bad performance, much like the rest of the cast. Steve Trevor is a supporting character all the way, but given enough detail and action to take him really crucial to Diana's education in the ways of the human world.
The rest of the cast (as I said) are all on good form, and someone should give Robin Wright her own action franchise immediately, if not sooner!
Plotwise, it's (as others have said) a bit by the numbers. I did see the Aries twist coming, but only because I watch a LOT of films and it seemed like a good twist to pull on the audience. I thought it worked very well.
The big Boss Fight was just that. I would've liked to see something more interesting than chucking debris and blasting lightning/fire/power of god at each other. It served it's purpose though.
I hope it's a huge hit and Warner Bros keep on this path. I had a great time.
To illustrate how entertained I was; Diana really becomes Wonder Woman about halfway through, in a scene that (I thought) worked very well but... I wasn't bored waiting for that moment. It had kept my attention and I didn't look at my watch or ask myself when it was going to become "Wonder Woman"?
It was, throughout that first half, a good film already.