Being slow is the point, it's like a western in that sense. Lots of talking and buildup, shits of the environment and stuff. Probably seems like a weird comparison but it's pretty accurate, so people go into it expecting a speedy pace it doesn't have.
Actually, Dragon Ball Z Kai is an edit that addresses this pacing "problem", but it ends up sucking out the tension from scenes. Worst offender is a scene where Vegeta puts everything he's got into a blast to try killing Cell, in the original it's a desperate, epic 5 minute power up, but in Kai the scene looks like a regular attack no different than any other in the series.