I was worried about the CSK bowling but defending 181 was a great job and winning by 18 runs was even better on a belter of a pitch.
T20 is a chancy game all right, but Chennai have all the elements of a champion T20 side: some class batsmen (Vidyut, Badri, Fleming), some big hitters down the order (Dhoni, Morkel) and a decent bowling attack which, although not too special, can hold its own in this competition.
Delhi on the other hand have had only a few individual performances with McGrath being a huge factor in the bowling line-up. So I wouldn't say that Delhi is superior to Chennai as a team.
In fact, with the exception of Bangalore Royal Challengers, I would say any of the 7 teams in this tournament have a great chance of beating each other.