It must be a fucking joke, 75 on the list. It is true that their latest albums are not very pop punk but only with All Killer No Filler should be much higher.
There are many bands I haven't even heard of, as dff_pink said, at least I can find something new.
But Sum 41's rank seems really low to me... And altough I like the number one, but that one to be in the first place is ridiculous I think.
I don't really listen to enough bands to know enough about the genre, so I don't really care about rankings like this. You run into a list like this every once in a while and most of the time it's something between #4 and #9 or something. Still, pretty cool stuff if you want to find new bands to listen to