Yeah - if I had to actually live on some of that "prepper" food, I'd probably be sick awhile at first. I just keep a stock of the same stuff I eat anyway and rotate.
But all this talk of MRE's made me want one, so I fished out out of my stash, menu 18, beef pattie (from the B group, don't know how many groups there are. Some pictures:

This is how you know you've got the real deal - these aren't legally for sale.
And here's what's in this one:
The little white pack at the upper left has lemon ice tea mix, two mints, salt, a wet wipe, and a dry wipe.
In the boxes are the pattie, and a serving of "mexican style macaroni and cheese.
The brown packets contain:
"Cheese filled cracker, pepperoni pizza flavor"
"Beverage powder, lemon lime" (I assume this is the one they gave you the hot beverage bag for)
"Cheese spread with bacon"
"BBQ Sauce"
Two packs "Wheat snack bread", which I guess is the bun for this.
No matches in this particular one, or coffee, but some of them have both.
It would take me awhile to add up all the calories in this one, but 3000 doesn't sound far off if you actually eat all that.
The ones sold as "just like" the official ones aren't anything like this, your mileage will really vary on those. Once this stuff gets back to room temp (it was almost frozen in my storage) I'm going to have a go at eating it.