Metalcore is a very formulaic genre with many bands falling under the same sound. This is very typical of bands who fall under the Rise Records label, they're often ridiculed and parodied because of the similar musical style and influences and the majority of them sound very 'cut and paste' examples of bands like this are Attack Attack!, Miss May I and Make me Famous. These bands stick to the formulaic conventions of the genre heavily and don't really try to differ from the conventions, and follow all the rules, such as incorporating multiple breakdowns, dischords, clean vocal passages and dowtuned riffs.
The Devil Wears Prada
However there are bands who challenge the rules and can still be classed as a metalcore band. Examples of this are The Devil Wears Prada, letlive (to a certain extent) and Underoath. These bands are seen as changing the genre and often disregarding some of the common conventions. The Devil Wears Prada are famous for starting off like a typical Rise Records band. (regarded as the first band to start that trend off) They quickly left Rise Records and joined Ferret who are a more hardcore orientated label and started to incorporate more of the hardcore elements in their music. Gradually over time the band has got heavier and heavier while other bands (normally on Rise Records) have got less heavy and started to become what TDWP started out being. letlive. are a band that have incorporated many genres into their music they can be labelled as hardcore or metalcore but really they oppose genre and don't want to be caught under the same net as typical metalcore bands.