My little list of thoughts..
ANOVA: Not much to see? Where is the (fine) detail? Buildings look bland. Try extending your roofs a bit to the outside. No models. Displacements with NODRAW texture. No sounds.
DABP: //
DARK: Cool geometry, some stuff doesn't make sense (clock??). Displacements are very noisy and rough/messy. Snow on roofs have to be models or overlays, displacements look bad. No sounds.
DRWRENCH: Weird ambient lighting. Odd, geometry. Ropes in 3Dsky are obviously way too thick. Some dev textures still visible. Boring square shape. No sounds.
GODSLAYER57: Same as ANOVA, extend your roofs. What the f*** how many supports are that under your roofs? SOUND! Random water. Overal feels a little bland.
GRAZR: Nice detailing, feels too square. Enough fine detailing (shrubs, rubble, props, ...). FFFFF those metal walls. Those underwater barrels are affected by a weird kind of fog. You stole the toilet from goldrush

SOUND! Spectator camera!!
JETTI: The real mine! Boring lighting (everything is lit the same way). Some lights without props that can actually cast the light. I would make a mine look darker. Nice spytech part. No sound.
LOCNLOL: No fog, nothing to see. Basic blocks of buildings, no additional detail. Why did you make it mirrored? It looks really boring. No sound.
LOCUTUS: Thick roofs, thick planks, ... Looks unfinished. Lighting angle doesn't match Skybox texture! No rotated textures, no fine detailing. Boring square shape(s). No sound.
MICKANATOR: I like the silos+mining tracks. Dustbowl roof, can't be unseen. You have a nice looking detailed shack, but no entrance to it, or no way to look inside from eye level. Inside the big building is really bland. No sound.
PLIPPLOP: Nice use of vertical space, Spectator Camera!! Try rotating your textures/experimenting with different combinations. Snow blend on bottom of cliff needs swapped alpha. Nice structures. SOUND!
RITZ: Basic (boring) square shape. Try thinking outside the box. Why is there a pit with a waterfall? Nice crystals, but texture needs work. Original idea. Water needs bigger scale. Waterfall textures look bad in the shadow. You should have tried rotating the map 180 degrees. Sound! Spectator camera!
SERGIS: Cool idea, I like the apres-ski hut.

Floating icicle up in the air. Nice idea of the snow on the fence, badly executed. Sound would have made it 10 times better (cracking wood in the fire, cold wind outside, ...). Spectator Camera! No sound!
TOMHOEN: An other square-hole-in-the-ground-map (see grazr, drwrench, ritz, ...). Thick roofs, bad textures. What's up with the fog man?? Not really impressive, sorry. No sound.
TYKER: CUTE minecarts!

Idea of moving platform is nice, but badly executed - ropes too thick as well. So are your roofs, they should be ~4 units thick, not 16. Interesting lighting. Sound!
YM: Nice structures, good use of rocks. Badly lit props. No sound/spec cam YM!! Feels unpleasantly cramped in some places. Good looking overal. Where is conveyer number 01?
ZHAN: Nice brushwork, good use of textures and shapes. Feels like a fine alpine mining scene. Sound + Spectator Camera!!