Minecraft is easy for the simpleminded person(not to offend anyone, sorry if i do :unsure.gif: ). To others who want to challenge themselves to build bigger things and make more complex structures minecraft is vast and infinite. Yes just playing straight forward like any other game and you will get bored, but you have to stop and smell the roses and admire the game. With 1.8 there is the added challenge of food and a mob that will chase you down and picks up blocks. So really if you get bored of minecraft just sit down and imagine something that you want to build or make and do it. If not then go get on some CoD or other game and have fun with that.
Making minecraft more difficult has always been about simply finding better challenges for yourself.
Minecraft is easy, and that makes it easy to lose interest, but at least the adventure update makes it take a while longer to lose interest!