i would disagree with this. they are THE determining factor in 9 out of 10 things you want to do post-college, and grades follow you for LIFE.
the reason i started a company is because i didn't have the grades to do anything else except be a bottom-rung coder (not even at a "good" company), which I did for a few years after school. i graduated a very good UC with a 2.01 C average (i BARELY graduated, i was put on academic probation 3x, and took an entire quarter off at one point). i'm not kidding around when i say "i'm a terrible student" like some people do - i actually had D's and F's and plenty of W's on my transcript.
even with 5+ years of owning a successful business, if i were to apply to b-school or masters/phd program, they'd probably reject my ass. when was the last time you heard of a C student getting into a worthwhile grad school?
1. Your first professional job after graduation 2. Your grad school application
Nobody else cares.
for example, if i had good grades, i'd probably have gone to work for a google-esque company, or gone to grad school, and i would NOT have started a tech business.
my life would have been completely different if i had good grades.
GPA is maybe a useful indicator of work ethic, but there are so many factors it's hard to be sure of that.
I wouldn't discount the importance of your GPA.
They matter a lot for grad school, though.
A referral from an employee who knows that you are competent and reliable is worth more in the hiring process than anything you could list on your CV.
As a counter-point to this, to anyone reading who might be discouraged, the research groups I personally know mostly care about sufficient grades (i.e. that you're smart, hard-working, not stupid). The ability to get outstanding grades doesn't correlate that well with research ability; it just correlates well with your ability to do exams.
Given sufficient grades, it's infinitely more important that, say, an addition to your research group is able to work well with the other people in it than what specific grades they got, and the people making the hiring choices are keenly aware of this.
And when you get beyond your PhD, it's your publication record that people are really going to care about anyway. If you get good papers into good journals, no one gives a crap about your grades.
The problem is that the vast majority of HR departments do not have the time to look at those other signals. Resumes are filtered based on GPA and other measurable numbers first.
And likely, if it's a large zombie-automated HR department, I wouldn't want to work there anyways.
I do put it, because I can say that with that score (not GPA, but 94/100 score) I was the best of my class/generation.
The Resume is an advertisement, you don't see Coca-Cola advertising that their sugary drinks can make people fat.
Are you going to try to talk with the professors personally? How and when are you going to do that?
edit: furthermore, how do you know the professor can single-handedly have any impact on who gets admitted into the program?
Sure, that's a pretty good idea.
> How and when are you going to do that?
Figure it out. If you want a cookbook solution, the answer is probably to just play the GPA game.
Even if you don't get the position, there's still a lot of value to be had from a conversation (for both parties).
My perspective may be too cynical though.
When a professor writes that on his/her personal/research website, it means "I already have grad students coming out of my ears, and I don't have enough grant money to support even half of them." This is useful information, because you (should) pick a grad school based on who you want to work with. You need to look elsewhere if all the professors you want to work with at a particular school are over-subscribed. Some professors also become jaded by the sheer number of unqualified candidates who can't hack it: None of the string theory groups in my school will talk to you until after you've been admitted, gotten good grades for a couple semesters and the passed department's second-year screening exam with a good score.
Let me part with this: I got into grad school (probably) mostly because I sent an email to the professor who ended up being my research advisor. I described what I did in the past (which was sorta-kinda tangentially in the same field), omitted any mention of my (not very good) grades, and asked a non-time-waste-y question about the research group. The thing about grad school (at least in the hard sciences) is that one of the criteria for admission is "doesn't anybody want this candidate in his/her research group??" When you have someone pulling for you on the inside, getting in is a whole lot easier.
That's what I believed at first. Then I realized how concerned authorities are with grades. If you're looking to do work with some research group, people want to know your grades. If you want to get into certain graduate schools, you'll most likely end up competing with people with high grades. Grades aren't a super important determining factor but, of course, they are considered and they can be treated as a negative indicator if poor.
Nobody really cares that you decided to challenge yourself. If you don't at least try to optimize for grades, you're basically shooting yourself in the foot. If you don't optimize for grades, you'll be competing with people who do.