I think their music is overlooked a lot because of Bono's good-old-fashioned-boy image and the sometimes cheesy stuff (even Bono's voice is cheesy as hell). And they've been clearly repeating themselves sonically in the 2000s.
They haven't always been like that. In the 90s they experimented a lot more with music:
Has Adam Levine's singing voice always been so whiney? I remember when Maroon 5 debuted, he didn't sound as whiney as he does on "Payphone" (even tho I love the song). Or does it just vary from song? I've only heard their singles.
Where Have You Been is my favorite single of the year, next to Blue Jeans
Pharrell | Bruno Mars | Rihanna | P!nk | David Guetta
Adele | Kanye West | Pitbull | Macklemore & Ryan Lewis | Robin Thicke | Will.I.Am | Justin Timberlake | T.I | Maroon 5 | Imagine Dragons | Taylor Swift | Lana Del Rey | Justin Bieber | Calvin Harris | One Direction | Christina Aguilera | Britney Spears | Wiz Khalifa | Coldplay | Psy