I think McCain had a good start, but Obama eventually owned him on the issue of economics. McCain is one-note. All he wanted to talk about was cutting spending and earmarks! and McCain started slow on national security (particularly on Iraq) but got better and better as the debates moved forward.
The Verdict: Even. Obama won on the issue of the Economy. McCain won the National Security part.
More: This is good news for Obama to go even with mccain in round 1 on foreign policy and national security because this is mccain's forte, and for him to get a tie is beating CW expectations.
From Kaus: McCain's small victory
UPDATE: Many feel mccain lost in the debates because the economy weighed more than national security among voter concerns, and obama did better on economic issues.