From season three onwards, it's easier to list my skips rather than watches. Between the good episodes and the ones that are just okay but important for later, there's not many I consider 'disposable' for want of a better word. If I had to skip eps in seasons 3 to 7, this would be the ones...
Season 3
Meridian
Distant Voices
Through the Looking Glass
Shakaar
Season 4
Shattered Mirror
The Muse
Season 5 is a weird one because I have no hard-and-fast skips, but I do have four "I guess they're not terrible, but I don't care much" choices.
Let He Who Is Without Sin
A Simple Investigation
Business as Usual
Ferengi Love Songs
Season 6
Resurrection
Who Mourns For Morn?
Profit and Lace
Season 7
The Emperor's New Cloak
Every episode on this list has something positive to offer though.
Season 3
Meridian
Distant Voices
Through the Looking Glass
Shakaar
Season 4
Shattered Mirror
The Muse
Season 5 is a weird one because I have no hard-and-fast skips, but I do have four "I guess they're not terrible, but I don't care much" choices.
Let He Who Is Without Sin
A Simple Investigation
Business as Usual
Ferengi Love Songs
Season 6
Resurrection
Who Mourns For Morn?
Profit and Lace
Season 7
The Emperor's New Cloak
Every episode on this list has something positive to offer though.