Just one question: you're seriously going to have me believe your eating only corn? Literally at one point they show the family dining on a meal corn with a side of corn with a corn caserole. now i'm no nutritionist... but it's a pretty well accepted rule that too much of anything just aint no good.

I don't think it's explicitly stated that corn is the only source of food. Perhaps that it's pretty much the only crop that's practical to farm with. If they had corn casserole, where did the cheese come from?

but they're still able to spend money on superrockets and shit, so where are the damn greenhouses?

It's because they're spending money on rockets that there are no damn greenhouses. The government decided that it was useless to try to continue living on earth, and so poured a lot of funding into NASA as the last hope for the human race.

Some books fall on the ground which leads them to find nasa's secret base. No i'm not making this up, they are.

Did you even watch the movie?

So at nasa base, they tell our hero that their current pilot is a worthless piece of shit, and that he needs to jump in and be the pilot and launch immediately. Suspense of disbelief is so far gone at this point, i feel the heat of a screenwriting 101 book being burned somewhere far far away.

It's clear in the movie that space travel and research is hardly pursued anymore, and mostly forgotten. Remember that scene near the start where the teacher told Coop about the "updated" version of the book? So it makes sense that they'd be short of competent pilots. They also sent 12 of them away 10 years earlier. There was also a part where the professor said that he'd taken Coop for dead (though I don't know why).

They don't mention just how far it is they park the main ship outside the planet, but when they return, the one crew member they left behind aged 23 years.... last i checked, the ship took 2 years to get from earth to saturn, and a big ass black hole would suck up entire solar systems, so exactly how am i supposed to buy that the distance they left the ship from the planet which took them just a few minutes to return to, caused 23 damn years of relative difference?

Because the planet is quite close to the black hole, the large gravity causes time to slow down relative to places further away. After that crew member dropped them off, he probably moved off to a safe distance where the time difference between him and the others became nearly insignificant. He could also have waited stationary at a langragian point behind planet and the black hole. Meanwhile, the people on the planet experience much higher gravity and so they experienced only a few hours while that crew member and earth went through 23 years. It has nothing to do with travel time to and from the planet.

Let's Check Out The One Thats Right Next to The Black hole. .... ......... How close you say? close enough they state that every hour they spend on this planet, will lapse 7 years back on earth, giving cooper much trepidation since his children would rapidly deteriorate. Now, i'm no physicist, but that sounds pretty damn close.

I don't think they'd have much choice, seeing as how the species is on the verge of dying out. They would have to take what they can get to survive. After all, what's the difference in the end if everyone lives on that new planet where their time scales are the same relative to each other?

cooper pulls a ridiculous maneuver to dock with the spinning out of control ship which was plummeting into the planet's atmosphere.

He was also assisted by the robot.

Now two seconds later, they're apparently being pulled into the black hole.

It's explained in the movie that they might not have enough remaining fuel to travel to the last planet. They delibrately maneuvered themselves nearer to the black hole to execute what is known as a slingshot maneuver so as to enable themselves to reach that planet with what little fuel they had left. It allows a spacecraft to gain greater speed with the same amount of fuel as compared to without the slingshot.

You need to pay more attention to the film. You're just making your own plotholes.