Starfinder Core Rulebook is simply great. I can't say it in any other words. The art is beautifully done... Rules are comprehensive and fun to play. A lot of useless rules from Pathfinder was dropped while new ones were introduced.
New races are interesting and you really wish to play them after reading about them. Classes are diverse but they could use a bit more balance (which can happen in the future - we know Paizo) - it isn't gamebreaking though (like some people claim).
Starship rules are nice addition. Complex yet quite easy to understand. I mean some things could be explained a tad bit better but it isn't by far badly written or anything!
Setting is fun to explore too. I might say that some things could deserve a bit more explanation, something is a little bland but then again - there isn't as much space for it.
GM segment of the book is fairly standard. Nothing really new but still well made.
So overall... I would give the book 4,5 stars - not full five. There are some balance issues, some tiny problems but overall? Overall this is one of the best sci-fi RPGs I have seen in a while. So yeah. I would recommend it.
