MY DD who is entering K in about 2 weeks is the type who is still reading Bob books and/or still laboring over Dick & Jane books, as some PP said. In fact, these take her so long that she doesn't find it fun and vastly prefers to be read to from picture books. So I am not pushing it at all b/c I don't want her ever to think reading is not fun. She adores "reading" (looking at her books, scrutinizing the pics to figure out the plot, repeating (in her own words) what we've previously read to her, things like this) and I just want her to enjoy it for now.
Now, if she is STILL this way after a year in K, yeah, I will start to worry.