Due to Goodreads I started off with the 5 star rating, though not exactly how Goodreads said (2 stars out of 5 is ok?) and since i've been reading more I've ended up going to quarter stars (rounding up or down on Goodreads as appropriate) and I know that can be a lot so here is just a quick overview of what the ratings mean to me personally. For .5 and .75 ratings I do round up because Goodreads does not, as of writing this, have 1/2 stars.
1 star- hated it
1.25- 1.75 stars- severe dislike
2-2.75- disliked, not severe, ok
3-3.5 stars- ok, I liked it
3.75-4.25 stars- really liked it
4.5-5 stars- loved it!