I think he did a great job with translating Watchmen to the big screen while changing the ending just enough to make it so much more eloquent.
About SP, well I think it is one of those rare movies that is not afraid to talk about real world problems and in this case it tackles the way women are still treated in this world as of today, along with child abuse, corruption, power abuse etc. I feel that only when such issues are brought to the forefront and not kept in the dark and only if we accept them for what they truly are, can we set about beginning to change things for the better.
About the whole 'sexualisation/objectification' argument I'd like to say that unlike so many movies out there that use women purely for selling value according to the 'sex sells' mantra none of the scenes in SP except maybe the dance sequence from the extended edition are shot with that intent. Just because Snyder chose to talk about specific female related themes in an adult, grimy, grungy and fantasy setting doesn't mean that it was a '13 year old's fantasy' as some have stated earlier. Snyder makes us face the dark realities and we don't like them and write them off as unimportant.
The way Scarlett Johansson was posed on the posters for TA and CATWS, shows more obvious objectification what with all her assets being enhanced and emphasized. Heck, SP didn't even have a real sex scene, unlike the hundreds in the TV show GOT. Let's not have double standards here.
The whole collecting 5 objects thing was actually influenced by a psychological theory called the Kübler-Ross grief cycle. Here's the article, it's a very interesting read >>
LINK
Also this >>
http://worddoodling.wordpress.com/2011/03/28/why-sucker-punch-is-smarter-than-you-think/
In the end it's up to you how you want to see the film.
About the action scenes, I can agree with you partially since I personally found only BB to deliver completely, with TDK great in terms of villains and story but lacking in physical quality (which I can say is a given considering the Joker's more psychological threat) and TDKR just lost any visceral quality to it completely with horrible fights and action.