Artists/Bands who are weak vocally but successful

[AndyD]

I thought I'd start a thread to get people's opinions on solo artists, duo's or band's who are successful but who are weak vocally or have a weak lead singer.
By successful, I mean successful and not a local band you know that nobody's heard of. Mainstream/commercial acts if you will.

Now, bear in mind, everyone is entitled to their opinion. There are artists who I think are weak but others will disagree and vice versa.
We're not saying the acts suck or have bad songs but just have a weak vocalist.
So lets not harp on someone who has a different opinion please. Thanks.

Ok, so I'll start. IMO, some weak vocal acts are:

RHCP
Metallica
Prince
Rihanna
Good Charlotte
Green Day
Maroon 5
Limp Bizkit

Can't think of anymore right now but if I do, I will add them,

So have at it folks!