Ahh greetings music snobs
Just because they have some mainstream sucess, doesn't mean they are devoid any quality whatsoever. I am sure you think the all these popular new rock/indie bands are just shallow pop wannabes and for the vast majority, I would agree with ya.
But the Strokes are clearly a cut above and from what I see certainly don't milk their cash cow to the extent of most bands of this vein. To dump them in the same category as the Killers et al with a sweeping generalisation is to sell the Strokes very short tbh, makes me sad that it happens.
If it sounds good, then its good baby. Thats how I judge music and if you do it any other way then you just got it wrong.