I really have nothing bad things to say about Adsense. I'm a single employee. I started 7 years ago with only 1 site just as a hobby. 3 years later, I left my high paying job as a website designer when my Adsense income surpassed it. Just last year I added 5 more sites. My page views are going up and earnings as well. With my adsense income, I'm able to buy a house, a luxury car, and support a family of 4, for that I am very very grateful.
There is just no other feeling to do what you love and get paid for it. Working at home is great. No longer must I endure lengthy commutes to the office.
Adsense/Adwords is the future - there is just no competition that come even close. Believe me, I tried them all. The closest is probably AOL but they only accept big publishers and will only deliver ads for US and Canada visitors.
My only wish is that if only I had a good command of the English language, then I would earn even more.