I only got in a couple of rounds so I'm no expert. I'll have a better impression tomorrow so expect an update but basically.
Most of his moves are either slow, short ranged or have obvious startups. The key to playing a good Hazama seems to be doing things very unexpected and placing yourself where you need to be via drive. His drive makes placing him where you need to be easy. But at the same time this means that where you are compared to your opponent becomes very important.
Getting good at him relies heavily on understanding spacing. For example his B&B combo 5b+5c+3c+214d->C+5c+4D, etc, etc. The first bit is easy, but connecting with the 4D is very difficult at first. Getting it to hit isn't too bad, but unless you've distanced yourself just right you won't be able to finish the string and end up with mediocre damage.
Same deal with his Anti air moves. They have great priorities but small hitboxes. (Like is 623D and 2C)
And yes 632, 632 B is great for getting out of pressure or cornering opponents. But unlike most characters Hazama really doesn't have amazing corner games so I't generally better to try and stay away from corners.