For some reason, I feel like the Tier sets in Wrath were less ... effective, maybe ... than the Tier sets in TBC and Vanilla. For me, the main differences are colors and uniqueness.
When I think of old Tier sets, I remember the colors more than anything else. The red and gold of Lightforge, the black edged with red/gold of Judgement, the blue and gold of T6, and even the purple of T5. The Wrath Tier sets, on the other hand, have as many as 3 different variations, and that greatly decreased their memorability. You couldn't just look at someone and recognize the Tier set, like you could in the previous version.
Of all the paladin sets of Wrath, the white T8 may have been iconic enough to stand near T2 and T6.1 But having the other recolors of the same set diluted the effect.
The other issue with Tier armor this time around is that the non-Tier armor shared the same look with the Tier. Perhaps that this was done so people would look more cohesive, not have the "clown" effect of TBC. But it just made Tier feel less special. You couldn't just look at the crowd and pick out someone in her full Tier set.
Blizzard should step back a bit and make Tier armor feel a bit more unique. Use a single, iconic, color scheme for both normal and heroic variants. Use a different, more generic, armor model for non-tier gear. Tier armor pieces are the main Loot as Reward items in raids, the armor you collect and save in your bank. Someone in full Tier should look significantly different than someone in mixed gear, and that really wasn't the case for most of Wrath.
1. Also, T10 should have gone with pants. I like the plate skirt/cassock of T2, but it's something that should be used sparingly, and regular plate pants worked better with the rest of T10. The skirt/cassock works better with sets that have a cleric-ish vibe, but the dragon helm of T10 evokes knights.