TLS 1.0 needs to be phased out at some point. Due to recent NIST re-scoring, it looks like TLS 1.0 is no longer PCI compliant as there are no longer any viable ciphers for it without RC4. See discussion after the change, here:
TLS 1.0 is still generally considered acceptable, but support for it should probably limit servers to an 'A' rating. Doing so for TLS 1.1 is probably also be warranted (not that much of anything negotiates it).