Warriors have higher base health. Pallies also have traditionally been REQUIRED to stack more stats and less mitigation than warriors, so even with +16%, T6/6.5 warriors typically STILL HAD MORE HP ANYWAY.
"300 HP"? lol, the only thing paladins had to have besides the "default warrior tank stats" is spelldamage, and not that much (just look at a bunch of prot paladins using almost full prot warrior gear without spelldamage, even choosing the prot warrior 2.4 badge gear instead of the paladin ones). Warrior not having strengh on its gear is a huge threat nerf while paladins not having it is a plus (only enchanting spellpower instead of mongoose on his weapon + any ubber badge gear with spelldamage and you're done with it).
Higher mitigation and survival is what warriors were all about. Warriors suck at aoe tanking while paladins shine at it. People didn't understand that and think that paladins should be exactly the same as a warrior, but with the plus of powerfull aoe tanking abilities (and get pissed that blizzard gave a ghetto aoe 51-talent skill for prot warriors).
People even choose Druids over Warriors for high hitting bosses 'cause they can eat crushing blows in a way a warrior or paladin will never be able.
That said, with the WotLK changes DK's, Wars and Pallies will all use virtually the same gear, so they might tweak the % a bit.
It seems to have been un-buffed last update. Regardless, HS is what it is because pallies are meant to have the edge in AoE situations.
You get Last Stand on 6 minute (!!!!) cooldown.
Pally "shield wall" is also 50%, war is 75%.
Spellpower remains the same for paladins and strengh was a useless stat for them, now they'll be able to use it to increase even more their spellpower (all that while paladins get damage buffs from spellpower in their spells that they didn't had or were small buffs), while for warriors, strengh was, is and will still be a powerfull stat, that we'll only have (back) in wotlk, and you'll not get a "%str to crit chance or increased threat for each ability" like paladins will get for spellpower (remember, holy damage bypass mitigation, while damage from str not).
And please, I think that every warrior would choose the 4 min/50% shield wall instead of 30min/75% one. (and lol, last stand will never surpass a shield wall utility, lol and pallies have LoH, wich is powerfull now in wotlk with 20min CD and not draining all mana).
Warriors Shield Slams can proc free insta-slams. Warrior shield slams dispell effects. Warrior shield bashes can potentially silence.
You can only proc free insta-slam if you actually use one, if you loose threat, you loose rage, without rage, no slam, no free slams (and remember, talented and only 2% chance of that happening). Blizzard says that prot warriors will gain rage even without getting hit by the mob, but... yet to be seen.
Dispel is more usefull for PvP and shield bash silence is talented (and not that usefull in PvE... tons of *immune* mobs).
Pallies can now finally compete with warriors as tanks, and it's about time!
Only in WotLK? Do you play WoW since the prot paladin revamp in 2.0 or stopped before 2.0 and trying again when wotlk launches? Currently, Paladins ARE the 1st tank choice in TBC, be it 5-man/heroic, 10-man raid or 25-man raid. Warriors and Druids became the situational tankers (when you need charge/intercepts, spell reflect, mobs are immune to spell damage...). The only reason prot warriors are still used in 5-man/heroics is because we are on a shortage of tankers on most servers, so, most of the time you can't choose what type of tanker you'll take and instead take the one that is avaiable. Altough sometimes I see ppl asking for prot paladins only even with this tank avaiability problem.
I bet you never been removed from a ZA raid because you can't aoe tanking there easily. Go play a prot warrior and get removed after the bear boss or not even get into the raid group 'cause they will try the timer, where you can't keep changing ppl and loose precious time and using a paladin against the bear boss would be the same (while using a warrior for the gauntlet is not).
Paladins have blessings (and for now, BoS!) where warriors can only shout one buff for the entire party (and only 2 mins wasting a much needed rage for threat skills). Wanna Kings/Salv of battle shout? lol.
If you ever played a pally you'd get tired of the constant "SHUT UP AND HEAL FGT" psts.
Playing as a prot paladin in PvP? LoL. Not that they're not usefull in PvP, but that's the only place where a prot paladin could hear that. If you're tanking and ppl says that to you, please, leave the group, they aren't good players and the run will only give you repair costs from wipes.
In fact that's much more a Ret paladin problem (both PvE and PvP).