my score: 2 to 3
Have had 2 trucks that were 4x2 ( '66 F100 and 92 pathfinder)
Never had the Nissan stuck, and I think 80% of my "stucks" in the Ford were due to bald tires (I was a low-budget guy, just ask my wife).
Since then, I've had a K-1500 (virgin girl truck--- soft, but never got stuck

)
An old W-100---also never stuck, but, was really tired, and needed lots of re-work/re-hab---
This big ol' RAM... also never gets stuck.
(my definition of "stuck" requires another vehicle to extract you. . not simply a temporary loss of traction... . they all did that!

)
I'd have trouble going back to a 4x2... If I'd never gotten 4x4, I'd probably never think I "neeeeeeded" it, but now, I don't think a truck's complete without it. .
Purchase/resale makes it a "wash", but costs about 1-2 MPG during the time you have it..... if lots of miles/year, an occasional towtruck might be cheaper, but, who wants to wait hours for him to arrive?
4x 4me 4ever