Ratings of levels.             
Playability, quality/complexity in order of my consideration
There are 16 with monsters
Leak = levels with leaks but they work ok.
d is an f

          Monsters  Rating

222X3DM               c
ARENA                 a
BASEDOOR              d
BASIN                 a     
BLACKMAJ      y       c
CHAAG         y       a
CLAUS         y       d
CRYPT                 b+
CTHCRUSH              d
CULT          y       a
DBTD                  a
DOGGET1               a
DOORH                 d
DOORV                 d
DOTD                  c+
DUNG                  a
DWANG4M8              a
EDTEST1               c    -- too bright, partly my fault, texture used
EXAMP-1               c+   leak
EXPLVER1              d    leak
FLICK         y       a
FLOODTEL              b
FONTI                 b+
FORTRESS              a
FRAG                  b
GEOM         y        a
GHOSTS       y        a
GLASS                 d
GONDOLA               c
GUNS                  d
HIGHDIVE              a
HOUSE                 a
JET2                  d
KEEP                  a
KYSENTY2     y        a
LAVAPIT               d
LEVEL        y        c+
LURK                  d          missing txtures, not worth to fix
MAP01Q                a
MELEE01               a
PAGAN        y        a
PLAT1                 d
PRAY         y        a
PUSHER                d
Q-BASE                b+
Q-PALACE              b
QCHUNKS               a
QK102                 b
QTRICKS               d
QUADROOM              d
RAZORS                d
REACTOR               a    (like ghosts, slight changes,no monsters)
RGFLDTEL              b
SCOHOP                b
SCURRY       y        b
SEWER                 a
SHAKE2                a
SHRINE                a
SLIME                 d
SLIPGATE              d
SWMPCV91     y        c
TBOX         y        c
TEF_AOP      y        a
TELEX2                b
TELEXB                b
TEMPLE                a
THISISTE              a
TLEVEL       y        c
UNDER                 b
WATER                 d    -- leak
WATERPIT              c
WEEX1                 b
WETDEATH              b
WINDP                 b
