Blu-ray Movies - why/how ?

[Cameh]

Greetings everyone,

I'm pretty new to the forums even though i've been reading the news for quite some time now. So this is my first post, here I go.

I own a PS3 and a couple of BR movies, which I love, it's awesome, etc.

However, I got some weird newbie question :

How does it work when they release an old movie on BR format ? I mean the movies were recorded with old systems (excuse my poor vocabulary I happen to be French well, not totally so I'm all excused I suppose).

I've read the 1st movie to be recorded on a HD camera was "Miami Vice" ??? Does that mean all the movies released before and available on BR are expected to be "crap" quality compared to the newest movies ? (I mean the DVDs are already fine)

All that's left is to cross fingers for Steven Seagal movies to be on BR ! (JK of course)

Thanks for taking a minute to read that pile of crap I just wrote

PS : You better answer me or I release the French version of Walker Texas Ranger upon you all !!