TwoKnives:
second, i think hl1 mapping is quicker nad more
comfortable, if i make a hl1 map in hl2 it will look s**t becouse
everyone is using 1000000 props to make their maps look good,
Good point except later on your post you say that HL1 maps look better than HL2 ones. Awesome word Dr. Contradiction! 
other than that:
Displacement tool is s**t in my opinion, becouse
if you make like a hill, it's hard to even place props (<= argh!) on
the ground PROPerly (<= eehw). i can make hilly terrain in hl1 just
fine with triangle terrain.
You can still use the old method. 
HL1 maps do not looks bad compared to hl2 maps, you take half of the
good hl1 maps and they are all better than the hl2 maps, only thing is
that the textures etc. are way more detailed in hl2 and the graphics
are nicer, but if you would look at the architecture , ost of the hl1
maps are way better than hl2 maps.
I've only seen like 3 good hl
maps so far and they were made by good mappers, while i've seen some
realy nice hl1 maps made by 'worse' mappers.
Halflife2 is barely out, of course there are no great maps. 
my conclusion is that hl1 mapping is not limited or whatever, and it still is better than hl2 mapping.
The grid is imited, the amount of entities, brushes, faces etc are all limited.
but that IS just my opinion
Newsflash: It's wrong.