Tirion Fordring
-Was a Warrior/Knight turned Paladin, hence his incredible battle skills.
Bias much? It's not like Tirion was the greatest warrior in the world to begin with.
-Fought back for years against the scourge with no military back up, entire armies failed to do as much.
As far as I recall, most of those undead were simple mindless undead. I could be wrong, though.
-Purified Ashbringer with his faith alone.
"Alone"? Pretty sure him being in a Light-blessed place helped as well.
-Was overpowering DK Darion who was wielding the corrupted Ashbringer.
-Defeated the Lich King one on one at Light's Hope Chapel.
One: the LK was in sacred ground. That diminished his powers a good deal. Two, Tirion just did one attack. We could just chalk it up to a lucky strike, too.
-His light overpowered the Lich King on one of the most unholy ground in all of Azeroth at the very place where the Lich King is at It's strongest.
Considering the LK's attention and power was focused elsewhere, not sure it's that great of a feat.
-Shattered Frostmourne at the same exact place.
Ditto above.
-Paladin's class hall tells us that Tirion defeated Arthas in a duel at the top of ICC.
-Succeeds where the players fail (Light's Hope Chapel/ICC) and is portrayed as the start of the show and a greater force than the player character.
Who is brought to the brink of death after sniffing the breath of a single demon.
-The LK says that Tirion could've been his greatest Champion, recognizing that he is the strongest fighter attacking the Icrecrown Citadel over the likes of Varian,Garrosh,Thrall,Saurfang or the PCs
Could it be because Tirion was his polar opposite? Saurfang is the Chuck Norris of WoW. He's just a warrior, overhyped by the community. Garrosh is just a pleb warrior. Varian is just a warrior. Thrall, other than the Tournament, never set foot in Northrend, I imagine.
Turalyon
-Was a Priest turned Paladin, his battle skills aren't as sharp.
He spent a thousand years fighting a never-ending war. It's safe to assume his fighting capabilities improved at least ten-fold in that time.
-Blinded an entire battlefield with his light and captured a weakened Orgrim Doomhammer.
He fought a legion for over ten thousand years.
-Defeated the DK Teron Gorefiend.
And who knows how many other powerful demons during that thousand-year war.
-A serious attack from him was easily stopped by weakened Illidan.
Tirion was going to be WTF-powned by Arthas if Darion didn't throw him the Ashbringer.
-Portrayed as weaker than the Champion of Azeroth who quest alongside him and needs help from Alleria at severals points.
What we see in the game mechanics does not necessarily reality of the lore.
-His army of the light gets trashed by the Garothi Worldbreaker and he doesn't do anything in Antorus because he is badly outclassed by Azeroth's Champions.
This is funny considering that, just below, you say that lore-wise in the LK Tirion duels Arthas instead of chilling while the players fight the LK.