This is just wrong.
-
S1 had an amazing Plate set that was pretty popular and a really good mail set, only part I hated where the boots of the mail set.
-
S2 sets where amazing again for Plate and mail.
-
S3 had a couple of great sets like the Monk and Druid set and I’ve seen plenty of DK and DH that love their sets too.
-
Covenant armor - the Necrolord Plate and Mail set where amazing, just for a more niche undead look. The Venthyr Plate set was great.
With weapons s1 had a really sick 2h sword, that was sadly only available to Venthyr. S2 had some pretty cool weapons for every spec and the legendary bow. S3 was pretty meh to me. The 2h sword you unlock in Torghast is really good and the BoE version is just perfect, sells for 400-600k on my server.
https://www.wowhead.com/item=190735/varruths-guillotine#comments
They might not all be things you personally like but there are some popular sets. Go run the s2 raid even on LFR and look at how many Mail and Plate classes are still farming the sets.
BFA had some amazing sets, but sadly every single one of them only looked good on 1-2 races as they where racial themed. There is only a single WoD set that is good, the Warlock set everyone and their mother uses. You never really see anyone use the other sets. WoD sets made me so sad as they where just horrible and low quality.