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The bikes are also crushable, so they cannot do much against a large army of tanks.
A bike is cheaper than a light tank, and much, much faster. No one buys light tanks if you can get bikes, as you can perform lightning fast hit & run attacks. I understand that if you are GDI, you should get medium tanks, as they can outrange the bikes and deal impressive damage. You never get to crush them, unless the player using them isn't paying any attention to them.
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SAM site is always out of the bunker. I loved the bunker logic in TD and miss it in every C&C ever since TD.
That's because it's not supposed to be a direct copy of the TD SAM.
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The mammoth always uses the missiles against infantry, and not only when turning the turret towards the target like in TD. Thus the Mammoth became completely unbalanced and overpowered against rocket infantry.
This is actually far more realistic than requiring to turn one's turret to fire a bunch of missiles. However I agree they overdid the damage against infantry. Note they raised the vehicle's cost from 1500 to 1700, even when all the stats stayed the same, because of this.