I didn't mind the lizard thing because first - it fit nicely into the whole "UFO Reptilian" mythos, and secondly the fact that they were harvesting humans for food gave it a slick horror angle that made it a little creepier. It just went flat, soft, and flabby after a while (Not that I'm against flat, soft, and flabby for - er - some of you nice WONDERFUL ladies out there - so don't kill me - lol).

The writers I guess got punchy and really really bored with the whole thing.

What YOUR talking about is the major flub up that happened with the "Highlander" films.
Those were really good and had a suspenseful thiller flavor to because you didn't know what the "prize" really was, and why the immortals couldn't fight on holy ground. That gave it cool creepiness - until they made them into extraterrestrials from the planet "ZEIST" in the second film - and that just ruined the ambience of the whole deal.

The first Highlander film I would call "Action Horror" - the second I would call "Schlocky Crapola".