I actually like the film. However what annoyed me about that part is this:
You've got a bunch of -mostly- super smart people. (Cooper not so much as he's 'only' the pilot, but the others wouldn't be there if they weren't very clever).
And they also know and have talked about time dilation, and that every second down there is longer -about a day- than on Earth.
Yet they just gung ho it.

They don't really work out beforehand how long the person (miller, I think) would've been down there and what things would be like from their point of view.
No. It's "uggg, signal. Follow signal. Most follow beep. Beep beep, hehe, beep".

And then they didn't really have a plan for when they landed. They just landed and went out for a walk like it's a Sunday afternoon stroll in the park.
On a planet with such excessive time dilation.

And that's not the worse part. No then, THEN, when shit hits the fan they send the robot (TARS, I think) to very speedily pick up the trapped person.

Now I'm no rocket scientist, but even I would want to know everything about that planet. The estimated time of how long miller (?) was there. And the quickest way to get the info needed, then get off asap.

They should've "Okay, time dilation is going to fuck us up. So we follow the signal. Land as close as poss. Send out the robot to pick up the person and info etc. Then gtfo of there sharpish. Agreed. Nice. Let's do this."
But nooooo, it's... let's half arse it. Go for a fucking walk. Fuck things up. Then, and only then, panic but then do things correctly.

Nolan, wtf were you thinking?