I like them. Mostly the older stuff, but some of the newer music is pretty endearing for some reason. Then again, I don't take them seriously, so I'm more able to accept it for what it is for me personally; Samey, but decent music.
It's a matter of opinion.
I listened to the videos playing their songs on either side...and they're pretty similar. A lot of the ques are the same, timing, and etc, however, I'm still very able to distinguish between songs. That might be due to having listened to them quite a bit, but I digress. I partly think this is intrinsic to most, if not all bands out there now. They develop a particular sound and that sort of becomes their musical identity.
I have an eclectic musical taste ranging from musicals and sonatas to screaming metal, pop, jpop, and industrial/trance...etc, etc, etc.
So, yeah. They're fine with me. Also, Creed is good as is Linkin Park. I have zero problem with the "mainstream" nonsense. I listen to whatever I find enjoyable.