1- no, I wished 3s had a non-ranked draft pick so I could try out team comps... Ranked I do yes, but for fun when, i'm just wanting a first win or something, no...
2- Tryndamere
Amumu
Orianna
Trynda and Amumu are both fine playing TT, Orianna was good before the patch, I just wasn't used to all the nerfs they did to her early game... and I play her a lot...
3- Darius has 40% armor penetration, if he got a LW our Armor would be useless and he also does True Damage.
Building armor early on champions that need damage, health, sustain destroys their build... if their were cheap armor items that would fit into our build then sure... but Amumu was building tank even, straight armor... he fell every time they tower dived him (when he had full health) they can silence, pull, slow, knock back... ect and on take one or two shots from the turret.