This is true, but I believe there's room for gray areas between these two absolutes. We can both take the character seriously, and still admit that, yes, we are accepting a level of suspension of disbelief that a man is wearing a ridiculous outfit fighting criminals. At the end of the day, a cape is just as impractical as an oval.
		
		
	 
Not really. Nolan and the Arkham games justified the cape EXTREMELY well. And the only reason it's impractical is because people can grab it; if you make it so that it electrocutes the thug when they touch it or something like that, then that solves that problem in  a way that makes sense.
I'm not against the oval, I just think  that justifying it by using the "lol man dressed as a bat" argument is incredibly condescending.
Imagine if the rest of the film was  approached with that same mentality.
Director for a  Batman film? "Pff who cares man dressed like a bat choose whatever director let's not take it seriously"
Actor to play Batman? "Pff who cares man dressed like a bat it's not like we need a talented actor for it"
Cinematogapher? "Pff who cares man dressed like a bat people don't even notice that stuff."
We'd all be pissed off about it, but suddenly when it comes to justifying certain cherry picked things suddenly it's okay to be dismissive about the whole character and say he's essentially a joke or something to justify some corny detail like the blue, or the oval, or a 12 year old Robin. As much as I've gone on and on against the blue, I at least appreciate the justification that navy blue is better for hiding in the dark.
Here's a justification the oval that isn't condescending: Part of the idea of Batman is to be a symbol to people. Criminals are not really going to see the symbol when he's in the dark beating them into oblivion (although I'd still say don't make the oval too bright) or when he's picking them one by one. However, when Batman approaches a civilian, someone that he's trying to save, they're going to see the symbol pretty clearly and they're going to remember it.