Is this a good fantasy football team?

It looks very good if it's a ten team league. The only thing I'd try to improve on is the RB position. I would try trading Rivers for a solid starting RB. KC doesn't have a good enough line for Johnson to be very successful like he had been. He should't be a starter on your team and Rivers should never be on a bench. So add another good RB and you'll be set. Good luck!