Both series kinda walked the same path. Although had two separate circumstances.
RE got too involved with trying to be like the films and RE4 was so hugely successful, they went full action retard. Although, I'd still play any of the games above RE4 above anything past MGS4.
MGS got really weird (weirder than it already was) and Kojima had a little too much control over his own product and no one to veto it, or co write the games it seems. The games became too simplistic with it's scope and got too anime/Japanesy. Not to mention, the plots became straight fan fiction tier.
RE got too involved with trying to be like the films and RE4 was so hugely successful, they went full action retard. Although, I'd still play any of the games above RE4 above anything past MGS4.
MGS got really weird (weirder than it already was) and Kojima had a little too much control over his own product and no one to veto it, or co write the games it seems. The games became too simplistic with it's scope and got too anime/Japanesy. Not to mention, the plots became straight fan fiction tier.