Catlover
Hall of Famer
Markieff is an MLE player, or maybe even higher, if he can sustain the production he's shown so far this season. Marcus's only value is the alleged positive effect his presence has on Markieff's play. By himself, Marcus is an unathletic SF with an average shot, no handle, and below-average defense. You can find a player like that anywhere.
Are you watching every game? Marcus has been even more inconsistent than his brother so it would be easy to gain a skewed impression of him if you're just viewing on occasion. Anyway, Marcus has been key in many of our wins and your description of him doesn't match up with what I've observed. To me, he's been better than his equivalent more often than not and you can't just find a player like that anywhere. CBS Sports player ranking this season show him as the 150th best player and Hollinger shows him as the 107th. Considering he is the 274th highest paid player in the game I think we're getting pretty good return on the player. Even if you discard the idea that they bring more value as a pair than each is worth individually he has more than earned his way IMO and there is no reason to believe he's peaked.