I'll answer you seriously. Take it as you will.
Neither one is really ok with me. The Hulk should be able to easily grab each arm and rip them off without even trying. He should be able to punch it so hard that (ignoring the jelly effect we all acknowledge should happen after super punches) the chest armor literally crushes Tony's body inside the suit. Superman should be able to do the same thing, or slice off portions of it with his heat vision, or toss it into the ocean, etc. Neither suit should stand a chance. The only reason Batman's *should* last a little while is because Superman probably isn't actively trying to kill Batman. If the Hulk were truly enraged and out of his mind like in the movie, he should have pulverized that fucking suit like it was nothing.
Unless the Iron Man suit is made from Vibranium and/or Adamantium, and unless Batman's suit is made from Kryptonite (I don't remember the metal of the ship weakening him, just the atmosphere and the "radiation" that I'm assuming is more of a sun thing, but perhaps you are correct), no mobile suit can possibly be more durable than say a bank vault door, which we both know gets shredded like tissue paper by either of these guys.
To answer the other part of your question, why were most people, including myself, not nerd raging over the Hulkbuster suit? Because it was fun to watch, and it wasn't exactly integral to the main premise of the movie. Avengers: Age of Ultron wasn't called Iron Man vs. Hulk, that fight scene was just a short fun little fan service scene. Batman vs. Superman is the (supposed, we all know not really) entire premise of the movie. If they only fight for a few minutes before the real story kicks in, perhaps none of us will bitch about it either. But if half of AoU had been Iron Man holding off, and even occasionally getting the upper hand on, an enraged Hulk, I daresay most of us, myself for sure, would have issue with it. Same with Batman holding off, and potentially ass-kicking, a Superman that's actually trying for half the movie. But maybe it won't actually be as bad as we fear from the trailers, and they'll move much more quickly into the (probably shitty) Doomsday stuff. Until we see the movie though, it sort of seems like physical confrontation between the two is a bigger part of the movie than Hulk vs. Iron Man was, and most of us feel that's just not possible without some sort of terrible movie shenanigans.
