They take out several soldiers before even being seen...that shows a considerable amount of intelligence & cunning.
The difference between these aliens & the ones in the other films is that these ones were actually being pursued by a powerful foe, they were forced to react against a formidable killer, instead of acting upon their discretion, as in the other films. They were ravaging the town, not concentrating on The Wolf. It shows how much differently they can react when they are the hunted, & not the hunters. The alien in the power plant scene demonstrated this, as it was aware of Wolf's presence before he noticed it, & easily snuck up on him & sent him flying through the air with a whip of its tail.
Admittedly, there were some scenes where the aliens could have severely injured or even killed Wolf, but didn't. Such as when he was holding two of them up by the throat...their tails could have easily pierced his chest from such a vulnerable position. That was mainly down to script immunity.