Considering the stuff that;s come out about how shittily Marvel treats VFX artists it really sucks to see a director, the guy that's the driving creative force of the project, shit on the work of people who probably worked really fucking hard to make that film, one that is heavily reliant on CGI, what it is. It's one thing for any of us or critics to say we thought the CGI looked shitty and bad CGI often isn't a reflection of the artist actually being unskilled anyway. But on some level those artists bought into his vision and sunk their time and skills into it so the very least he can do is not be a dick about it.