T10 Shaman - Animations of charging wild animals on the shoulders and a helm that actually looks "shamanistic"
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I loved druid T6. Was the coolest looking tier for druids with T5 coming in close second.
Tier 6 - Resto Druids (Thunderheart Raiment). I absolutely love the hawk helmet, plus it was very nice gear back then.
Pally T2. Idk why i like it so much, it just looks epic to me for some reson.
My most favorite set of all time is the Hunter tier 11 set. It obviously got a ton of texture work and love put into it, because the detail is just amazing compared to other gear. Plus my favorite color is green. :)
T6 Warlocks, wings... nothing more to say.
Definitely was Cenarion Raiment! It looks soooo Mother Earth, I love this one. http://www.wowhead.com/itemset=205#.
I liked the priest tier 1 because it fit the class so well
Priest T5 http://www.wowhead.com/itemset=665: as soon as I saw those angel wings, I knew I had to have 'em. Eventually, I only ended up getting two pieces- I quit serious raiding after Mount Hyjal- but at least it was the hood and shoulders, the best parts! Even now, after six years of playing a priest, and far too many instances of Blizzard saying "oh, well, let's just give the new priest set a subpar-looking hood and slap on some crappy glowing to those shoulders"- I still remember those angel wings.
I like Druid T1 and T2, mainly for the shoulders.
I absolutely loved Redemption Armor, mainly during wrath, as the 4 piece bonus allowed paladins to only use one heal -- Lay on Hands. Quite gamebreaking imo! The shoulders did also look pretty cool :P
I think the zenith so far has to be the T5 sets; they were just jaw-dropping models. As only my Druidess was even eligible for any of those pieces (my others being city/AH/crafting alts), each piece of T5 Druid was a joy.
Hunter Tier 6, the gronnstalker armor was my favorite. I loved BC raiding and my hunter was what I played so after all that time getting attuned and working towards sunwell, it was awesome getting that next piece to drop.
Warrior T2, Battlegear of Wrath Battlegear of Wrath, edges out a few other as my favorite tier set. It's far more functional than Might (T1), but it still flashy and intimidating, especially on an Orc. Seeing warriors in full T2 in vanilla WoW always gave me impressions of unstoppable juggernauts. The plate armor is also reminiscent of Roman Legionnaires and medieval knights combined. Warrior T3, T5 and T7(.5) echo T2 and are amazing in their own rights, but T2 was the first of its breed and as such will always hold the crown.
I'm a big fan of the DK tier 8, though I must also say, that while the priest T5 doesn't look to good on an orc, it does look amazing on most priest races, and is probably my all time favorite.
My favorite has to be either Shaman T6 (Skyshatter) or the Paladin T2(Judgement.) Judgement was definitely the top choice until I saw the Skyshatter. Skyshatter just looks way too awesome on especially space goats, but its still very nice on all the other races. Judgement is more of a Bloodelf/Human set I think, mainly because it looks too compressed with dwarves, and the tauren horns really get in the way of the whole look