Well, I've been using mine for a full 8 years now without issues. Maybe I was just lucky. I use it daily for work and my personal time. At work I do heavy spreadsheet work, personal I do Final Cut Pro, Photoshop, blogging and browsing.
I just swapped the useless SuperDrive with SSD and Fusion Drive'd it on year 2. Two letters of the keyboard came out, plastic feet came off and battery only lasts ~1,5 hours even when just browsing but other than that it works fine. I wish they made a new Macbook Pro to justify renewing this one. I can feel its age, can't justify purchasing a new 15" one for all that money and won't switch to Windows.