I'm taking it you havnt done much ravanah ex with competent dps. While tanking, you do the lowest dps of all tanks, which isnt an issue save that you are going to be constantly worried about threat unless you have a ninja (or bad dps). Most rav ex paladins can only do halone->halone->goring. Royal is a pipe dream.
Shield Swipe also is not tp management. Every time you hit the button, you gained back a whopping 10 tp. It costs less than what you regen--sure but its not free. It also tends to lead to your debuffs falling off, so generally not ideal. Want to regen tp? Throw out a flash--regen a full gcds worth of tp to throw into better combos.
Paladins aoe is a joke. OT damage is the weakest of the three. The shield and 2 of your cooldowns (the things you get in return for your low dps) are useless vs magic (meaning that, vs heavy magic, you basically enjoy all the paladin CONS and none of the Pros. Weird design). Yes we were great when everything was physical, but not that its not, you have to question why you have downsides that apply all the time and perks that apply only in some content.
Wars are currently far far better overall tanks, always solid, always working at full potency save for -one- cooldown. Excessive threat means they are free to switch betweens stances as needed. Great (best OT), and not lacking at all as an MT (equilibrium is an instant clemency without the ridicoulous cast time for instance).
Paladins have too many abilities that work well in dungeons that are basically useless in raids is kind of a key issue. Our aoe has built in blind, but no damage. Well the blind is 100% useless in raids. Pacification is useless in raids. The ability to chain stun? Useless in raids (save for slimes in a3?). Paladins were designed and still carry too many elements from early 2.0 and need to be rethought out. Massively over buffed ---no--no one is saying that. But in a world where drk and war have constant damage buffs, incredible threat and seem better suited for future content, Paladins are not in a great position.
Also--who thought a 3.0 sec cast on a tank ability was a great idea? I would understand if it didnt cost half your mana bar, but it does. It already has a limiter!