I'm going to give my two cents (while wearing flame-retardant apparel). Of the franchise, Raiders is an unquestionable cinema icon, and then goes downhill from there: ToD is mean to everyone (women, children, Hindu culture and peoples, etc.) and borderline offensive, while making no sense at all as a prequel; Mola Ram was fantastic though, I give it that. Last Crusade is an inferior rethread of Raiders, which nerfs Sallah and Marcus Brody into bumbling fools, and is absolutely appalling to the female antagonist Dr. Slut, I mean Elsa Schneider, making creeps of both Joneses. As for the fourth one... Well, Crystal Skull is like all those Disney animated sequels... it doesn't exist in my mind.
Will I watch DoD? Maybe as soon as it hits a VOD service, and then depending on the reviews.