the main strength is that a certain amount of the enemy weaponry will have been made useless. If you have only Armour 11+ facing the enemy then anything less than Str 5 is no threat at all, and your priorty will obviously be to remove Anti-tank weaponry first. The whole army won't start in escalation, which can be a strength or a weakness depending on how you play and your opps army/tactics/deployment. However its certainly better to have the whole army not start than getting taken apart piecemeal
As Wraith said mobility in 4th is a huge deal and as long as the Mech list has the wheels then its sweet but as soon as it gets a puncture from a krak missile then your screwed as your small amount of infantry is left all alone with out support and outnumbered.
Another down side to them is the fact that most lists these days are written with them in mind and people are prepared for them when they make the army. Very obvious way to take them down as well which basically means that if you've faced one mech list you've faced them all.
ok lets look at it this way in 40k there are 3 main factors in any game movement, shooting, assaulting BUT and i mean a big but, movement is the only one that does not rely on chance so because of this fact any general who knows how to play with mech have covered the one phase that does not rely on the dice to decide his fate he chooses his own path and how fast.
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