You're just carried away with your emotions. Dhoni had an off day. He dropped the most crucial catch and his choice of bowlers was mind boggling to say the least. CSK are a top class team and yes, their bowling is their weak link but every team has their weaknesses. And pardon me, but to term every brilliant performance as a fluke just because today someone didn't perform is just sore from your side.
If you bowl decent to good and still get scored off like that, I call that a brilliant performance. But CSK just fed Rajasthan with atrociously hittable deliveries despite being asked to bowl a certain way. And again, I wont agree that the captain puts all the blame on his bowlers for not executing the plan. You pick the right players and if you didnt do that, you can't throw them under the bus.
CSK's tournament has been mostly based on luck. And that luck has started running out in the last 4-5 games.