Starting a Skaven army: Pros and Cons?
This is not from me, but I approve it :)
Skaven pros -


They have access to vast arrays of troops/troop types, and can get them in vast quantities. 
The leadership rules they come with over-ride what would be a fatal
weakness and combined with the new re-roll of all leadership tests
allowed by the BSB and the general's leadership in a 24" diameter
bubble they have the same Ld as dwarfs, ie impregnable.
They have excellent magic capacity and at least one game ending
spell, which is now far easier to cast now in 8th irresistibly.
The new initiative strikes first regardless of charge now makes even
their weaker troops likely to inflict a credible ammount of damage on
all but the most heavily armoured foes.
The Storm Banner can, for a tiny cost eradicate their greatest
weakness - being squelched by template weapons and shot to death -
yes it affects their own troops to, but this is generally less
detrimental to them than it is against other armies such as DE, HE,
WE, Dwarfs, Empire, OK of which (generally) most of their opponents
will come from.


Cons - 


Such a large quantity of troops on the table means the potential for
being bottlenecked against terrain, the newer terrain rules have
nearly removed this as a problem for skaven now.
The ability to be lose all their Ld bonuses by being flanked was a
great problem, but in 8th the most common flanking units, fast
cavalry have been hit by needing full ranks to break ranks. To give
the fast cav enough ranks to both survive getting to the flanks and
then (as ranks are counted after combat now) last long enough to be
able to break the ranks is an option. This falls under analysis though
as with 2.5k or 3k skaven can build a battle line that stretches from
table edge to table edge and presents no flanks to the enemy.
Overall I believe skaven have really been boosted a vast amount in
8th, but regardless of numbers they will die in droves in HtH against
any and all opponents, it's just a case of will they fail their
stubborn ld 10 re-rollable break tests over the course of the game?