If you need power, fine. Buy 15" rMBP, iMac or Mac Pro. Basically for people who admire portability and small form factor rMB is perfect device. It's perfectly capable enough to do all light computing tasks and also some slightly heavier tasks like some Photoshop work. Personally I could do all my work on iPhone or iPad if just the software was capable enough. I wonder why people who knows for sure that rMB isn't for them rant about it being too slow. Obviously it's too slow for their usage but perfectly capable for many others. Rant over.