I already own the second one, but I'm aware of some of the changes they made to it.
It's not horrible but mistakes were made. The coop in the second one is great though. IMHO. The MP less so and the SP is a mixed bag. But the coop alone makes R2 worth a purchase. While since I played but I believe coop is still active online for R2.
Try to be reasonable... its easier than you think...