Of all the times I've bought Apple Care, I've not had any major problems with my MBP/iPhone/iPad. The only 1 time I decided not to get Apple Care was for my current rMBP and in the last days towards the end of the warranty, the logic board decides to be funny and fail.
Thankfully, I called Apple up before the end of the warranty and had them lock it in their system. So now, after they've repaired it for free, theres an additional 90 days on the logic board.
To get or not to get, its really up to you. The repairs are costly but so is Apple Care. Each Apple Care adds up to quite a sum of money. I believe that if they can offer over 3 years of coverage in total, they stand by their products lasting at least that long. For portable computers, I highly suggest getting it covered.
Your mileage will vary.