Considering he was 17 at the time and his parents self published (until they got a deal with a big publisher) the first book isn't to bad. I liked it alot.
if you liked the movie you should love the book. I was actually disappointed a bit with the film and anyone that knows me will tell you that doesn't happen often. The casting was great, but some of their decisions were, unwise, in my opinion. (and if you catch the quote, you'll understand)
The second book is much better though. and is 3-4 times the size of the first (hence the talks about it taking awhile to get through it
). you can see his skills improving quite a bit. He weaves several alternating stories together quite well and i found the B storyline to be almost more enjoyable then the main story. Many of the side characters actually out shine Eragon IMO (and Elva was a surprise and very inspired). Though despite that he remains likable.
I have the third, but got sidetracked reading it. i should learn not to buy another book till i'm done with the one i have cause i always stop that one to start the new one