Number 1, I've seen Chris Martin not only on Youtube, but live—twice. I was fairly close enough to observe Martin's on-stage act and I can assure you they were both excellent shows.
Number 2, it's quite obvious from this board that one doesn't have to be a non-U2 fan to find some of Bono's moves on stage embarrassing, not to say annoying. There were a few cringe-worthy moments for me when I saw U23D. But then, I saw U2 live numerous times, so I'm able to put his on-stage persona into context.
And a Coldplay fan would probably say the same thing you say: That Martin is attempting to connect with the audience through his moves, however frustratingly clumsy or annoying they seem to you.
Finally, you never really addressed my point, which was that it's not really fair to criticize someone's on-stage antics based on random video clips when you've never seen the entire show—in person.