Pros:

no mercy beta style very nice 
darker then original no mercy
cool to have beta style maps
a few changes to no mercy original maps nice
l like it 

Cons:

no l4d2 ter2 weapons no spas 12 magnum scar m sniper rifle ak47 no l4d2 health items m60 m79 launcher mac 10 smg chrome pump shotgun

a few spots we're bots don't fallow the player can be bad for player if s.infected get the upper hand on the player one bot stop and wood not move had to kill em he got stuck in a zombie spawn spot by the elvator on the 4th map got smoked in the spot and stop 

not on l4d1 :(    

Conclusion:

over all a good set of maps that are in beta styled no mercy had fun playing it wood love to see a l4d1 port