The days are long gone when we all diagramed sentences in fourth grade. Our high school graduates are grammar free, and it will show throughout their careers. Lazy teachers and students can't fake correct writing.
k,
Yes, it shows in college.
When I was in grad school I was a TA for intro history courses. In one class I worked, students had to submit a few paragraphs every Friday discussing, very generally, one of the week's readings.
I was shocked, frankly, at how poor some of those papers were. Most were OK, a few really stellar, but then some were just abysmal. This situation was pretty much the same for all the TAs in my class year.
One in particular I was convinced was ESL; I'd never heard him speak but he could barely spell, let alone construct a reasoned argument. I assumed he was a foreign student and having trouble writing because of it. Turned out he wasn't foreign at all, just a victim of a piss-poor school.
Now, that also begged the question of how he even got into the university, but I leave that for another thread.
Sad, because businesses will pay a premium for good writing and articulate speech. This is the edge that a college education no longer provides.