Magic items can be anything and you're arguing the players are entirely metagaming. Which is fair given that's your experience, but neither is a knock on how the class is built. But even if that's the case, sword and board is a fine option, and Shield Master is a fine feat to go with it. But maybe more importantly this might be a good argument for more feats to choose from.
As for cookie-cutter, here comes another Paladin with Aura of Protection. Here comes another raging Barbarian. Here comes another archer Hunter Ranger. All the other fighter-types you mentioned are even more cookie-cutter than a Fighter who at least has 6 good feats to choose from. Why aren't those other fighter-types viewed as cookie cutter as well? My guess is it's because of hold-over prejudices from prior editions regarding what feats "should" be rather than actual lack of versatility with fighters.
Magic items can be anything true but some are a lot more common than others in official adventures.
Is there even a magic polearm in the APs?
It's not meta-gaming if it's information that the characters should reasonably be aware of. If all of the stories they've heard about magic weapons are about longswords, and none of them are about polearms, then that's something they should take into consideration when deciding which weapon types to focus on.Magic items can be anything and you're arguing the players are entirely metagaming. Which is fair given that's your experience, but neither is a knock on how the class is built. But even if that's the case, sword and board is a fine option, and Shield Master and Sentinel are fine feats to go with it. But maybe more importantly this might be a good argument for more feats to choose from.
[MENTION=2525]Mistwell[/MENTION] I think you are overestimating the value of a single feat. A bonus feat at level 6 amounts to little more than +1 to attack and damage rolls. .
As if that was even the limits of what a +2 increase in an ability score does...A feat is NOT little more than a +1 to attack and damage rolls.
[MENTION=2525]Mistwell[/MENTION] I think you are overestimating the value of a single feat. A bonus feat at level 6 amounts to little more than +1 to attack and damage rolls. At 6th level the fighter will have 18 Strength and Great Weapon Master while the paladin will have 16 Strength and Great Weapon Master. The +1 to attack and damage rolls doesn't really compete with +Charisma to all saves for the paladin and his allies, utility spells, and smite spells.
As if that was even the limits of what a +2 increase in an ability score does...
It's not meta-gaming if it's information that the characters should reasonably be aware of.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.