Yeah, I'm not going to say that undergrad doesn't matter, but your grades are not exactly an indication of whether or not you're getting useful life and professional skills out of it. I was a straight-A high school student, but finished university a semester late with a 2.975 GPA. I've since had a wildly successful career in software development (my degree is in electrical engineering), and my college years toiling about in labs are but a dim memory.

Certainly the name of the school on my resume helped me interview for my first job, and I did learn a bunch about how computers worked and how to design CPUs, and that was useful early in my career when I worked on embedded software (like actually embedded, weak-ass MIPS machines with a handful of MB of RAM, and no MMU or memory protection[0]; not the tiny supercomputers that count as "embedded" these days). But my grades, and most of the getting-my-coursework-done drama? Irrelevant.

[0] And I'm sure some folks here will consider what I had to work with a luxury.