I absolutely hate paintball masks with a passion; I own a JT mask only for use when a field requires a full mask. Usually I run WileyX ballistic glasses or ESS NVG Profile ballistic goggles.
Everyone has an opinion, and everyone is entitled to wear more than the minimum level of eyewear if they feel the need to protect themselves further, that being said I am of the opinion that full face masks detract from the realism I like in the sport. I've been playing since 2002 and I have never been seriously injured in the face by a BB. To each their own though...