Two stars means "It was OK" on Goodreads, according to the hints they display next to the stars. Three stars is "I liked it" (while it's "it was OK" on Amazon).
As for someone reading the entire series and rating every book two stars - could be someone who rates "low" in general, and is perfectly happy to read books they find "OK" (and perhaps already bought the entire series, therefore don't feel any particular desire to drop it as it's not like they're actually disliking it).
I've seen quite a few people who tend to rate low - they'll praise a book in the review and give it three stars, while leaving the fours and fives to books they (perhaps) feel aren't just good entertainment / an enjoyable pastime but true pinnacles of literary achievement.
But yes, subsequent books in series do tend to get higher ratings than the first one, and this makes perfect sense - people who didn't care much for the first one are usually not going to read more, so unless the author writes a real stinker, or the series takes a sharp turn towards something it wasn't to begin with, most people who keep reading will be those who are likely to enjoy it quite a bit.
As for reviews - I also noticed, back when I tried to read at least one self-published book a month, that unless the book was completely horrible / illiterate / completely lacked anything reminiscent of plot, grammar or coherence, I tended to be more lenient with my ratings and reviews compared to trad-pubbed books - I would rate something four stars when a similar-quality trad-pubbed book wouldn't have got above three, and so on.
I'm not even sure why that was - a combination of lower price and actively wanting to be encouraging, maybe? I wanted the not-illiterate self-published authors I read to succeed?
There's definitely some element of rating and reviewing differently. I'm not sure how significant it is, or how many readers even pay attention to whether a book is self-pubbed or trad-pubbed, but it's one factor to consider.
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