knights (primary) are really good tanks when new content comes out. but then as the other x/k classes get the new gear they usually do better since their gear gets more on par with the difficulty.
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pvp they arent as great since their damage is lower and can get out damaged by half the other classes and outhealed by healers. as for pve they are the best tanks hands down, but rogue/k or warrior/k do more damage and eventually get enough armor to tank the enemies (opening a spot for another dps that the tank/knight would have filled).
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every combo in rom has its benefits, so i'll just list a few good things about the combos. its debatable and you should pick what you like the best (get to level 10 or so, if you want to start over it wont take long to get back to ~10):
knight/priest - low damage, but good threat management. good for holding single targets like a boss, but not as great at groups (still good though). has healing skills but they will be weak.
knight/warrior - good damage for a knight. has a 2nd aoe attack for groups (whirlwind). can use rage to keep mana up a little longer. higher damage means higher threat for keeping aggro.
knight/rogue - also good damage. a little higher critical chance. can equip two weapons for faster attacks. one problem i find with 2 weapons is that you lose the shield defense, which is alot and i dont like that at all. i would rather have a warrior/knight using a shield than a k/r without a shield. has a passive dodge increase but its not too noticable.
k/scout - can equip a bow for quick long range pulls. has 2 extra taunts in case something jumps onto a weak party member.
k/mage - i havent seen many (1 endgame) and theyre decent but i prefer the other combos. has lightning armor which hits attacking monsters providing additional threat. its whirlwind shield also slows enemies that it hits.
thats just a quick rundown, there are so many little things about every combination in the game. trying each combo is the best way to find which one you like and one that suits your playing style.
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rogue/knight is good because it has high damage, high dodge, and Enhanced Armor (high armor) is overpowered for a secondary skill. it gives so much to every class. rogue takes it and has dodge, parry, armor, and damage, which is good. one problem is that when brand new content comes out and the enemies are really hard, sometimes r/k cant tank it because they dont have as much armor and life as a knight primary can have. theres no way to tell if it will be nerfed since thats just the way the classes work, rogue dodges because its a dexterity class, has high damage because its a dps class, and knight secondary has enhanced armor and gives parry. if they remove enhanced armor from a general skill (will change a ton and make so many people mad) that will probably be the nerf that can end it. as for buffing knights, they arent meant to have the highest damage, so they will probably always get replaced as other classes get better gear for the area theyre in.
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warriors are good in pvp and pve. everyone loves rogues because they can invis and everyone loves scouts because they are ranged and attack quick, along with other things. w/r became popular when swords of fear came out since they were a 2handers damage in a 1handed weapon, and 2 weapons = quicker attack = more damage, but of course other combos have their own benefits. other w/x combos each have their own things (w/k gets enhanced armor, which again gives great armor).
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edit/ if you choose k/x and decide you want the other side, k/w into w/k, k/r into r/k, k/p into healer p/k, feel free to do so. you will have to find new gear to match it, but you can switch to the other combo without losing anything. it will be exactly like if you started out as a w/k or whatever.
and..... inb4tl;dr
This post was edited by jalant on Jan 26 2011 03:16pm