Oh yeah, there is some fun action. The thing is though, probably because the film is so short (it's exactly 90 minutes, INCLUDING the end title crawl), a lot of it was already seen in trailers and previews. When I finally watched the film, I never felt I saw something that I already hadn't seen somewhere before. It's possible I was so curious about the film I watched too many previews and things like that.
For example, I was also really, really curious about the remake of Suspiria from last year, and I watched endless clips of it, things people had put on Youtube and things like that. But this film is close to 2 and half hours, so when I finally watched it there were loads of new things and it still felt very fresh (well, about as fresh as exploding witches can be).
I just wish they had made the film longer and given more weight to it all. In the end it felt a bit like a pilot of a series (which in a way it was, a pilot for a theatrical series) and it does establish the Jake/Roland relation fairly well, but I don't think it does anything interesting with it, because by then the film is already over. It does indeed show how they meet, but still it remained superficial feeling to me.
I think the actors were good and there was potential, but I think it was mostly a question of there not being enough money. I felt the film was short because they just didn't have the money to do more. Mid-World never truly impresses and they spent very little time there before going back to New York. I surely have seen worse fantasy/action films - in general I have a feeling it remains a genre that's hard to do, there are few films of the calibre of Lord of the Rings. There is a very fine line in fantasy/action where it can go from feeling epic to feeling cheesy, and a lot of it has to do with the production values of the film, and production design and things like that.
The Dark Tower never crosses the line in becoming cheesy, but it doesn't become epic either. It falls in the middle, a fairly straight forward action film with a fantasy theme and a story that is hardly worked out further than the basic essentials.