2D vs. 3D? — Please advise...

This is directed at people who've seen Prometheus both in 2D and 3D and can compare and recommend. I don't usually care much about 3D. I saw MIB3 last night in 3D (only because that was the time that synced up best with my schedule). I'm pretty sure that I would have liked it just as much or better in 2D. The thing I typically don't like about 3D is that things that would normally be in focus in 2D are intentionally manipulated in an unnatural fashion to make the 3D seem more important and "dramatic" somehow. For example, there are shots in which you can't see all of the types of aliens in the HQ (white room) clearly because their focus had to be "sacrificed" to create the 3D. I like to be able to choose where my eye falls. I don't like for it to be constantly *forced* to one region of the screen. If you've seen both 2D and 3D, is the 3D worth it? Is there something compelling about the way it's done that means that the first time I see the film, I should see it in 3D vs. 2D? I will not see it until a week from today in the US, Please don't tell me anything that's a spoiler. Thanks in advance for your advice.