It's really disheartening that over 15 years later and we're still having the same tired arguments about 4E. And that some of it is coming from people who worked at WOTC and should know better.
If someone from wotc says that 4's direction was influenced by MMOs I tend to believe them. Even if they weren't on the initial design team they likely had in person conversations with some of the original designers. The influence of MMOs is neither good nor bad because DnD has always stolen ideas and concepts from other games and vice versa. If people refer to WOW it's just because it's the most recognizable MMO out there.