I admit to judging a book by its cover, but I also pick up a book to read the first few pages before deciding to buy. I find the story must catch my attention, provide character(s) that I care about, and offer a promise to deliver something- adventure, horror, suspense, exploration, etc.
The first chapters must offer these elements. At Alexandra Sokoloff’s blog, she writes about this very topic. Her post, First chapters, gives a basic understanding of what you need to weave into your story at the very beginning.
In fact, the first chapter often gets offered as a free read from some authors with the basic principle that the reader will want to read more.
Now get back to writing!