Easy To Please - the only song I truly cannot stand. Obviously, it wasn't exactly their masterpiece, even early on, but Chris' voice just doesn't work.
Low - I'm amazed I don't see this one more. This is the kind of song people think of when they think Coldplay.
1.36 - Not awful, but definitely not quite up to par with the rest of the stuff from that particular era.
A Whisper - Not as terrifically awful as people make it out to be, but when compared to the rest of it's album and superior B-sides, it's too repetitive and lyrically fluffy.
Speed of Sound - Good song? Yes. But considering it's a middle of the road track, it's vastly overplayed and overrated.
Wonderfully, it really took me time to find five - really, there are only the first four, I just don't find Speed of Sound all that great. Still, condsidering I have most of the actual studio tracks they have and I can only single out these, I'd say it's a pretty decent library :)