I've heard over the years that some people feel the original Game Boy screen is terrible, sometimes it's not. There's also upwards of 8 (or 9) different revisions of the original Game Boy. Is this all personal opinion or are there actual differences in the LCD display/graphics hardware between Game Boy revisions?

I have a CPU-02 with an unresponsive mainboard and an LCD board full of dead lines. A CPU-06 that works beautifully, can't say the display is any better or worse than I remember it all those years ago. Lastly a yellow PlayItLoud which is CPU-08. The LCD itself doesn't seem a whole lot different but I think the surrounding yellow plastic affects my perception of the screen (that being worse than normal).

What are the findings of others? (also I didn't know where to put a thread like this. If it needs moving, go ahead)