2. Signs on the Metro are much inferior to the Underground. I've
been in London for 4 years now so perhaps am used to the
Underground but I felt the Metro's signage was really confusing and
incomplete.

In what way did you feel the signage was incomplete?

I may be wrong but I think London Underground is extremely fool proof. As
long as people can distinguish North from South, East from West. LUL make
the signage 'really ****ing obvious'. The line colours, North V South, East
v West means I could jump onto an unfamiliar station and flow through it
without much brain power. At various stations in Paris, signs would point to
different lines, I'd walk via the directions then come to an intersection
but less obvious pointers. I'd wander around for a few minutes until I catch
sight of a poor sign then move on. The Underground has flow. The Metro
doesnt.

You're just used to LU. Try riding the Northern (Charing X) Line
Southbound and getting off at Waterloo. Try following the signs to the
exit (they rather peter out - you're left deducing it by the fact that
you don't want to go to the bloody Jubilee Line, which there are too
many signs towards). If you want even more of a laugh, try finding the
subway under the main line platforms or the Waterloo & City Line.

Oh, and which way does the Piccadilly Line run? Get on an eastbound
train at Leicester Sq, ride two stops and you're on a northbound
train.

Paris has perfect flow if you know what you're doing (and they haven't
recast the bloody timetable in the intervening period - I waited a
good 10 minutes for an Austerlitz bound train at Pte d'Auteuil one
time before realising that all trains now went to Boulogne). Some
things aren't intuitive. If you arrive by TGV at Montparnasse and want
to go to CDG Airport, most people would look at the map, take the 4 to
St-Michel or Châtelet, then transfer to line B. For a start the RER's
nearer Halles than Châtelet (and don't even think about St-Michel),
but why walk all that way to line 4 (and it IS a VERY long way to
lines 4 and 12 at Montparnasse) only to sit on a slow packed train
anyway. The answer is, if you didn't know, line 6 towards Nation,
changing at Denfert-Rochereau onto the RER.