Blue is truly a Mountain bike park. The trials are built with mountain biking as the primary focus. I think what makes Blue the most memorable is the huge rock faces you are constantly going over. Where you see a trail elsewhere sometimes hit and go over a huge boulder, Blue is that half of the time. They also seemed to incorporate flow somehow, there are just sections where you flow right into and through huge rock sections. Blue changed my perspective of parks in the area. If you go to a place like Mooch in the fall when all the leaves are off the tree and look around you will see tons of the huge boulders that are off trail, and the trails miss these. It seems as if the designers of Blue looked at every boulder in that section of woods and then devised a trail that could hit all of them. I have to imagine that the trailbuilders at Blue are given a lot of leeway with whatever agency controls the park. Because the place is absolutely packed with trail. There are also a lot of sections where you can take alternate paths of varying difficulty and coolness.
Most of the huge features are well built to let you roll in and out of it, so the place does a decent job of being safe while looking and feeling very "extreme."
I would say that if you can ride and enjoy Sourlands, you will love Blue.
I've acquired all my worst mtb injuries there and i still love it.