Heavily Disagree, the jump in power is pretty big and the feats of the Cap/Spidey tiers are consistently in Tier 8.
Its incredibly insane one would automatically think his Mark 1 suit is automatically stronger than the goddamn missile because of one statement, a statement that is literally
CONTRADICTED in the movies
Tony Stark: That's because it's a miniaturized arc reactor. I got a big one powering my factory at home. It should keep the shrapnel out of my heart.
Yinsen: But what could it generate?
Tony Stark: If my math is right, and it always is, three gigajoules per second.
Yinsen: That could run your heart for 50 lifetimes.
Tony Stark: Yeah. Or something big for 15 minutes.
And the scene is then shifted to Tony's blueprints of Mark 1, ergo his arc reactor worth 3 gigajoules is powering up this armor. Unless in universe 3 Gigajoules is like EQUIVALENT to KILOTONS OF TNT.
We literally then see later on Mark 1
not busting down an Iron door within one hit, requiring multiple hits, High 7-C metal door? Then later on we saw Mark 1 getting
overwhelmed by BULLETS and being forced on its knees but maybe its High 7-C Piercing damage.
It doesn't help that we have a statement in the profile that has
Mark IV being 8 gigajoules per second, a consistent thing from the movie when we get a box of scraps version 3 gigajoules, to 8 gigajoules built in a good place.