The first one was just amazing fun. Get a friend and complete the campaign in coop. I did it with my cousin and we had such a blast!
Yes, it's quite short, perhaps not worth buying, but definitely worth at least one playthrough.
Best Lego game up to now and I dare to say that it's one of the best Star Wars game too.
Hopefully, the sequel will be just as good if not better. For me, it's a must.