pretty good it isnt too violent except when the Xindi aliens commit a sort of genocide killing 7 mil. humans
it gets a bit weird when Commander Tucker and T'pol have neuro pressure sessions (Tucker has his shirt off,T'pol applies the neuro pressure , though it is for stress relief so theres not anything really happening
Star trek Enterprise is another exciting and entertaining Star trek series, HOWEVER contrary to what CSM says there is more swearing (in my opinion) than any other star trek series, also there is a good deal of violence: charecters getting beaten up by aliens "phase pistol" shootouts and one episode where a character gets impaled through the leg by a metal spike. It's interesting to see how the crew makes decisions without all of the Federation's directives. Over all another excellent star trek series.