How did I miss this topic?
Alright, so... the bullets that I have the most difficulty in reading / dodging are:
3. Blue Animated / Glowing Bullets
2. SoEW Lasers
1. EoSD Bubble Bullets
The first two (that is, 1. and 2.) are there because of the "irregular" (note: I'm using this term very loosely) hitboxes.
"Metal Fatigue" Bullets (as you call them) don't affect me at all strangely enough. Red Animated Bullets for some reason I can read; which can probably be linked to the fact that I can't seem to read and dodge Blue Rice Bullets such as the ones found in Kanako's opener which I would have put down as my fourth choice (IIRC, the colors change by difficulty so if this is the case, it's present in the Lunatic version at least).