Looking through your list must say I really liked "The Atomic Brain" when I saw it earlier this year. Maniac is such a 'wrong' movie but I find it such an enjoyable one. Not sure if I want to go through Yucca flats again but Manos is one I like to revisit. My only planned revisit is Tormented (1960), I really love that film. Might give Child Bride (1938) and The Screaming Skull (1958) another go too. I have all 3 on DVD.
There is also Screaming Skull (1973) a remake having the same poster as the 1958 version on imdb.

Yes the Tormented from Mr. BIG is the one I'm talking about :)
It's totally different from Manos but Tormented has the director's daughter Susan in one of the leading roles (she must have been 8 years or so) that is where the similarities between the movies proly end., Her performance is actually I like most next to the special effects of the haunting scenes.
Killer Shrews funny you mention it I saw Deadly Eyes (1982) which is about killer rats. I have to say Shrews was way more entertaining even if it has less creature action than Deadly Eyes.
So far my best watches were:
Attack of the Beast Creatures (1985)
Humongous (1982)
The Green Slime (1968)

For worst there are several candidates problem is I have forgotten what happened in those mostly

to CPA
My spot (don't plan to see that many after a rather filled October challenge)

1) IMDb ratings points

1.0 = 6 points.
1.1-1.9 = 5 points.
2.0-2.9 = 4 points.
3.0-3.9 = 3 points.
4.0-4.4 = 2 points.
4.5-4.9 = 1 point.


2) First time view = 1 point.

---

At last I got going

1. Reptilicus (1961) imdb 3.6 points: 3 + 1 (FTV) = 4
2. Mesa of Lost Women (1953) imdb 2.5 points: 4 + 1 (FTV) = 5
3. Honeymoon of Horror (1964) imdb 2.7 points: 4 + 1 (FTV) = 5
4. Bloodthirsty Butchers (1970) imdb 2.3 points: 4 + 1 (FTV) = 5
5. Godmonster of Indian Flats (1973) imdb 4.2 points: 2 + 1 (FTV) = 3
6. The Green Slime (1968) imdb 4.6 points: 1 + 1 (FTV) = 2
7. Satan's Children (1975) imdb 4.5 points: 1 + 1 (FTV) = 2
8. Nightbeast (1982) imdb 3.7 points: 3 + 1 (FTV) = 4
9. Frogs (1972) imdb 4.3 points: 2 + 1 (FTV) = 3
10. Trog (1970) imdb 3.6 points: 3 + 1 (FTV) = 4
11. Barracuda (1978) imdb 4.1: 2 + 1 (FTV) = 3
12. Laserblast (1978) imdb 2.5: 4 + 1 (FTV) = 5
13. Blood Tide (1982) imdb 3.7: 3 + 1 (FTV) = 4
14. The Being (1983) imdb 3.6: 3 + 1 (FTV) = 4
15. Squirm (1976) imdb 4.6: 1 + 1 (FTV) = 2
16. Deadly Eyes (1982) imdb 4.5: 1 + 1 (FTV) = 2
17. Track of the Moon Beast (1976) imdb 2.2: 4 + 1 (FTV) = 5
18. Guess What Happened to Count Dracula? (1971) imdb 2.9: 4 + 1 (FTV) = 5
19. Humongous (1982) imdb 4.5: 1 + 1 (FTV) = 2
20. Sinthia: The Devil's Doll (1970) imdb 3.5: 3 + 1 (FTV) = 4
21. Attack of the Beast Creatures (1985): imdb 4.1: 2 + 1 (FTV) = 3
22. The Zodiac Killer (1971) imdb 4.4: 2 + 1 (FTV) = 3
23. Death by Invitation (1971) imdb 3.9: 3 + 1 (FTV) = 4
24. The Vulture (1966) imdb 4.1: 2 + 1 (FTV)= 3
25. Zero in and Scream (1971) imdb 3.9: 3 + 1 (FTV) = 4
26. Gurotesuku (2009) imdb 4.8: 1 + 1 (FTV) = 2


Total: 92 points