HID lights are NO BRIGHTER than normal halogen bulbs. they LOOK brighter as their light is off towards the blue end of the spectrum...or if you prefer , their colour temperature is higher. ( some photographer chime in here please). I think that the legal light output in Canada is 300 candelas measured by a governmnet mandated test...it would be on a gov.ca website somewhere.
ALL euro car HIDs have automatic leveling, Jeffs Audi, my BMW etc. required by law in the EU.
I am 90% sure that all the OEM euro HIDs that we get have most of the the euro beam pattern. A very flat "top" to the low beam, but we don't get the sharp uptick to the right...its legal in Canada but, I think, not legal in the USA.
One reason why people think HIDs are dazzling is because of that sharp cutoff. to an oncoming driver the light goes from nothing to full brilliance instantly rather than ( relatively) slowly increasing.
HIDs also take a noticeable time to ignite( several milliseconds to strike the arc and a few more to get to full brilliance)thats why hi/lo systems use a moveable shutter to go from low to high beam...
In the USA, HIDs are currently permitted but the auto leveling is not required and therefore not fitted. The standard USA beam pattern is already a bit diffuse with halogens and that doesnt help either.
Then add some horrible big SUV with the lights at the maximum permitted height and you get a dazzle.
Full size chevy trucks & suvs are particularly bad IMHO high lights, small reflectors or lenses they just splatter light everywhere.
As for me, short sighted anyway, not as young as I was, they'll have to pry the HIDS out of my cold dead...