Re: attacking bunkers
Okay, lets do the ideal attacking setup.
First as Clem said, you need something to clear the flak (ninjas) so that your armor killer will target the sentries/bunkers
Lets call the unit a flak (ninja) killer.
f-117 might do the trick, BUT they target ALL which can be tricky (if the target has a lot of gardenerns the firepower will be spread ie not good)
Second choice are PAs, they are a bit weak, but still better choice than f-117. PoMs are also good if you like distracting the ninjas more than killing them.
So first attacking unit is PA/PoM
Now that we got rid of the ninjas its time to remove the armor from the bunker/sentries
Depending on which the bunker has more of (bunker/sentry) you can chose wether you want to attack with health based units (assassins) or with armor based units (harrier/striker/CW).
Second attacking units (armor stripper) - assassin/harrier/striker/CW and so on
Last attacking unit (lets call it a sweeper) needs to be health damaging unit that fires after your Armor Stripping unit.
This can be again health based - SA or armor based TD/Apache/Ranger and all the rest you can think of.
Sweeper attacking unit (health damager) - SA/TD/Apache/Ranger/sniper and so on
And ofcourse, its always good to have lethal flak and what else in the game is a better lethal flak than attack dogs?
Lethal flak - Attack dogs
Now get your route setup right. If you are going to use PoMs this means that you need an armor stipper to fire after tha poms which doesn't leave us with many options.
So here we go:
1. PoM
2. CW
3. TD/apache/ranger
4. Attack dogs
If you are going to use PAs, then this is a good setup:
1. PA
2. CWs/striker/harrier
3. TD/apache/ranger
4. Attack dogs
But ofcourse those 2 setups are made upon the prediction that your target is using ninjas as lethal flak. If the target is using spike traps, then you can remove the flak killer unit and go heavier on armor strippers.
I would suggest using heavy units (CWs, apaches, strikers) as they die harder.
Some people might question my setups, but if you think, you can never get all of your 3 units (flak killer, armor stripper, sweeper) to fire before the bunker/sentry combo, so you have to get used to the fact that you will lose some units (Attack dogs).
If you go for a bunker without a flak killer this means that his sentries/bunkers will survive 2 ticks instead of 1, which means that you will lose twice more. And at the end, those setups complete the HD-AR-HD-FLAK combo that people are talking about. If done right, those setups should get your bunker guy killed in 1 tick.
I hope I was helpful, have fun while killing us.
PS: No route is overpowered, there are just people who can't figure out how to kill a route.