Different situations most likely. Destiny launched as an overhyped game that most felt didn't have enough content to justify itself to begin with. It then went on to release DLC that, for the most part, underwhelmed with the content again (Dark Below is more guilty of this than HoW) despite being pricey for DLC. People feel cheated and now Bungie is releasing a new DLC that's even more expensive, so a lot of people are wary or frustrated. Not to mention Activision have been greedy asshats for years with CoD, which adds fuel to the fire. Zeroes was bad but it was heavily criticised back then and (it seems) like Phantom Pain will more than make up for it content-wise. Ultimately I'm in complete agreement with you; the hate is stupid. But I can kind of understand why people would defend Metal Gear and not Destiny.