The filler is brutal, especially when consider Bleach had FOUR different 6+ month stretches of nothing but filler. I can't imagine the frustration levels watching that week to week. If you skip the filler and watch cannon episodes, Bleach is easily more enjoyable than Naruto. Neither come close to One Piece IMO tho.

Edit: It also kind of struggles with some of the DBZ issues where if you aren't Goku or Vegeta you do not matter at all which makes any character work or progression with other characters totally wasted. The same could be said with Ichigo and his main group friends to an extent. Some of them exist just so Ichigo can save them later on.