Originally Posted by Supermouse
It will not be repetitive, in the movie-going public eyes, because the love interest in a Superhero movie has never been given superpowers by the hero before. I can count exceptions easier than the normals: Jean Grey, Elektra, Catwoman, and those characters all met their respective love interest heroes AFTER getting superpowers, not before. This will be the first time a love interest has been upgraded from non-combatant to super-powered combatant in the third installment. So, new.
And your argument that it will be repetitive because so many people have armor would apply to the X-Men franchise as well, but that has not gotten redundant by too many characters having mutant powers.
An armored battlesuit is a very specific superpower. Being "mutant" is not specific at all, and just means you got your superpowers genetically. Doesn't mean everybody at Xavier's school has adamantium claws, or mastery over the weather. Not even remotely comparable to everyone wearing the spring collection of Tony Stark knockoffs.