Well yes. For someone to change so dramatically, it usually something monumental that cause them to re-evaluate their values. A bit of backstory would help the audience accept the 180 turn.
TNG Worf and DS9 Worf are, at most, 1 year apart. Since they didn't offer any reason for Worf's change, I came up with my own reconcile the difference. During his final year of service onboard Enterprise-D, Worf jumped between alternate universes (
TNG: Parallel). Our Worf lived out his life in a different timeline.😲 I'm rooting for the one where he married Deanna.🤗 I think, DS9 Worf was the one who got
ninth place in the Bat'leth tournament.🤔 Honor didn't keep his opponent from cheating, nor kept the judges from disqualifying the cheater. Thus, in Worf's eyes, Klingon honor lost the value it once possessed.🤫
IMO, they had a harder task than the rest of the actors due to their duo role of
bridge bunnies and outside observer. The were our source of viewing the human crew from a non-human perspective, like Spock, Data and Odo before them. And the Doctor, before Seven supplanted that role. For me, the best part of Voyager was the interaction between the Doctor and Seven.