There are lights that are too bright -- but the PB Blaze 2w is not one of them. Think something that puts out 10x as much light, and then maybe ...

It could blind people if aimed right in their eyes, but that's not where it should be aimed anyways -- it should be aimed slightly downwards so the bright spot of the beam is all on the ground in front of you.

I'm also not a fan of flashing modes for my headlight at night -- I want my light to help me see, not just be seen -- but that's probably more of a personal choice. If I did want a flashing headlight, I'd also have a non-flashing headlight in use at the same time to help me see.