If I might make a suggestion, I think you should go see John Carter.
Why, yes, that does mean that I liked it. Quite a bit, actually.
In fact, I thought it was a pretty darn fun movie. That seems to be a trend from the reviews and comments I've been seeing online as well. I suppose it could be selective reading. I mean, Flick Filosopher could not stand it, but while I can see where she is coming from and respect her point of view (unlike some of the insert-many-very-not-nice-words-here who decided to start a troll-fest in the comments section of her review), I do not agree with her overall takeaway. My experience with the film was quite positive, and it seems to me like the majority of the people who saw it enjoyed themselves.
Here are a few of the positive reviews I've come across:
io9: John Carter Will Dazzle You With the Best (and Worst) of Retro Futurism
Pink Raygun: John Carter Didn't Suck
Tor: Cynicism Aside, John Carter is a Charmer
Don't get me wrong, as a fan of the books, I had a few misgivings with some of the liberties they took, mostly because I thought they were either unnecessary or just weird choices. But if I'm being honest, I completely understand why either Disney or Andrew Stanton felt those changes needed to be made. In either case, the end result was, as I said, a very fun movie.
It's an adventure. It's a man who thinks he's lost everything struggling to accept an unexpected offer of new purpose. It's got aliens of many different shapes and sizes, ships that fly on light, some preposterous (yet fun) assumptions about how gravity affects a person from one planet to the next, and a woman who can hold her own with a sword and still do science better than the dudes. It's a real, honest-to-goodness, popcorn munching, laugh-out-loud, enjoy yourself movie. Completely worth the price of admission (though if you can find a 2D showing, I'd go for that unless you just really dig the whole experience of 3D).
Unless the negative hype you are hearing comes specifically from a person you know and who knows what you do or do not enjoy in a film, I advise you to make up your own mind. I think all of the negative press and poor marketing (and make no mistake, this film was marketed poorly when I look at the trailers and compare them to the actual movie) has set people up to expect it to fail miserably and therefore leads people to assume it is bad.
It's not. It turns out it is really kind of wonderful instead.
So, that's my two cents. If you're looking for a fun activity this weekend, good for pretty much everyone in the family, I vote John Carter.