We are participating in 3 of the 4 offered summer reading programs at our library this summer. With the exception of the fact that you can do the adult program without actually reading anything, I find them to be appropriate.
For the under 2 crowd, there is the sheet of activities to check off. It includes things like singing nursery rhymes, practicing animal sounds, and reading various types of books (animal, alphabet, counting, story, etc). Once you complete 12 activities, you get to choose a board book. Looking at the sheet, we could complete all the activities that are appropriate for my 9 month old in an hour. That's not the point of the program, but nothing is hard. It's mostly to encourage reading to babies and toddlers. We'll save it and turn it in later this summer even though we are done.
The 2-12 age range gets a paper with stars to color. They get one star for every 15 minutes they read or someone reads to them. When they get 20 stars, they can get a prize. There are both books and trinkets. The books are all 20 stars, but some of the trinkets require saving up their stars. My youngest isn't reading yet other than reciting memorized stories. She chooses 3 books before rest time and 3 books before bed time. She'll also bring me a book or two randomly during the day. This usually adds up to about 30 minutes of reading. They also get to color 2 stars for each library program or story time they attend. We usually go once a week to the story time with a related craft because my oldest enjoys it.
Students 10-18 (tweens can choose the kid or teen program) log hours. When they fill a paper they pick a raffle jar. I'm not sure exactly how many hours they need or what all the prizes are since I don't have a student in the program.
The adult program requires checking out and reading/watching 5 books, audio books, and/or movies and writing them on a recording sheet. These are also raffle tickets. Most of the prizes are gift cards. They also have a laptop for the big prize that will be drawn from all the non winning tickets.
Overall, I find it to be appropriate at each level. We take advantage because we are there anyway, and the girls like free books.