if a netbook is worth the buy?
Netbooks are smaller and lighter so are better suited to carrying around than a laptop but have some limitations because of that lighter weight and portability. I have and use both, they each have their place.
The fact that a netbook doesn't have an optical drive hasn't been a major issue for me. I purchased an external USB DVD burner for my netbook but find that I never use it so it was a waste buying it.
Netbooks are good for your everyday user, the only reason some may prefer the laptop is is more power and will be able to run more task at a faster pace.