1. they all look the same to me, you can interchange the members and they will still look the same
2. they all sound the same to me, you can interchange the members and they will still sound the same
3. they all sing the same, each and every member has the same vocal range
4. most of their songs are obviously made just to sell, nothing new, nothing extraordinary from the rest of the tracks
5. they dont play instruments. (personal bias I know)
6. as far as ive heard they dont even write their own songs, every thing is prepared and they just sing (horribly).
7. they are engineered from top to bottom to sell to "pichapies" and young girls who dont know real music
few execeptions like, Boyz to Men which i think is very talented