TNG, VOY and bits of ENT was based on TOS, which was based on the 50s style of SciFi TV shows. ie: Twilight Zone. Self contained episodes. TOS went outside the box with a consistent cast that went to the problems...But they didn't really capitalise on what that offered (movies did alot better in that respect) TNG did a little better, but it wasn't until DS9 that we really saw character driven stories. Voyager was more of the same, the setting in a different quadrant just gave the lazy ass writers an excuse to ignore much of the mythos of Star Trek that was built up in the Alpha and Beta quadrants. Enterprise seemed to be a heavy handed attempt of more of the same whilst trying to 're-write' the mythos. Season 4 undid Berman and Braga's mistakes, and in my opinion Season 4 of Enterprise is the best season of Star Trek ever. Period.