The first ones ("Alice In Hell" and "Never, Neverland") are essential Thrash classics. The singing is kind of weird though, but I like it and it suits the schizophrenic vibe of Annihilators music.
Waters made quite some good records but sadly he dropped these insane guitar breaks more and more on later albums.
those two albums are absolutely amazing....and I'm sure if you asked Willie Adler, he'd say those two albums were a huge influence for Lamb of God (As The Palaces Burn/Ashes In The Wake era).
(And I say that because there clips of them in a studio and he's on the phone with Jeff Waters, I think Mark Morton is on the new Annihilator CD...there's a bunch of evidence supporting this)