Great review.
I actually liked this one and I found it exciting despite its shortcomings.
My only big problem with the episode -- did they ever explain how the girlfriend got into the mysterious tank o' water? Did she fall through the ceiling and suddenly was transported or what? I admit I was making a sandwich during some of the episode but it struck me as a little odd.
As for Haylen, I didn't hate her and I didn't love her so no real loss for me if we don't see her again.
Oh and totally agree with the slowness on the CSIs part to figure out the last puzzle. They have a woman dying and they're excited over finding the magical dresser!stairs? Even if it wasn't one of their own inside the wall, I'd imagine someone's life takes precedence over how awesomesauce their discovery skillz are.
Overall though, I was entertained throughout.