Idk if this is still being updated, but...

Shen: He has high mobilitiy with his Shadow Dash, ultimate and summoner spells. If you see Shen shadow dash or see him use his ultimate (stand united), he is going to have a small period of very low mobility (Shadow dash cooldown is normally 10 seconds, safe to assume 8 secs). This is when you want to attack, burst him down with high-damage spells, since his natural tankiness helps protect against fast, low damage attacks. Disables are very effective vs Shen.

Galio: Galio has low mobility when he does not have access to flash. Constantly slowing or even stunning makes him an easy target for 2/3man ganks. Watch out for his ult however, it can pack a nasty punch on those who do high damage. Lowering his MR also greatly reduces the power of his spells (because his passive gives him more AP the higher his MR is.)

Here's how you counter every single hero in both DOTA, LoL, HoN, Starcraft Dota, and all other games in the foreseeable future:

FOCUS FIRE

Simple as that, no one can last if all 5 of you are attacking him no matter what build*

* If you go something ridiculous like 6 mana crystals I don't consider that a build

Ghetto way to kill any champ, enough stuns and other hard CCs. x,x sad but true they got merc treads BV and quicksilver plus cleanse...thats ok throw more stuns at them they'll die eventually x.x

Lux: Lux is an incredibly squishy champ, but in the right hands can hold off 1v5 at a tower. Her ult can snipe from about 1/5 of the map, making her an excellent mid. Lux players fall into 2 general categories: Bad or excellent. Since all 4 of her skills are skill shots, it allows for great players to really shine.

Shutting down lux early game is essential, because that is where she shines the brightest. Fortunately, taking down lux is relatively easy because she is so very fragile. Flashing in and stunning her would be the best way, but she can still be deadly. 2v1 is a relatively easy game for a good lux player.

Late game damage, she tends to taper off with most people. However, her build can be highly focused to remain competitive and she'll always be an excellent snare and shield.