Not everyone will agree so a poll might help provide an answer that is an average. I like a lot of the episodes already mentioned and i think some people are confusing "forgettable" with "not good"....take 11:59 for example...i hated that episode but as soon as you say 11:59, i immediately remember it so it can't really be classed as forgettable
When i rewatch Voyager, the episodes that i tend to have forgotten are "Resistance" - "Remember" - "Darkling" - Drone" - Juggernaught
some i like more than others but when i watch them again, i do kind of think....oh yeah, this one
I can agree with most of these...but "Drone"? Really?!