If you've never heard anyone complain about the reliability of their Mac, allow me.
I have a company-provided Macbook Pro, 2011 model, so about the same age as yours. The slot-load optical drive died within 18 months, and the RAM died shortly afterwards.
Having replaced those, I then had to later replace the power adaptor, where the cable wore out and was designed in such a way that it could not easily be replaced. $110 of your finest Candian dollars for a new one.
After that, the hard drive recently conked out, so that was replaced with an SSD. To add insult to injury, OSX Yosemite disables TRIM on any hard drive you didn't buy from Apple. (Dear Apple: fuck you.)
And now the return key has broken in half, a fortunately cheap if irritating repair job. One of the USB slots is also on the way out.
The only reason my laptop is still alive is because I can easily open it up and repair the components that break. Were that not the case, I would have been several laptops in by now. The fabled "Mac reliability" is a myth.