The terminator was exactly amazing at aiming. It was designed to infiltrate bunkers and commit mass shootings. Fighting an xeno would be way way beyond it's parameters.
Alien blood varies massively throughout the series. In the first film one little drop goes through 2 decks of a spaceship. If a terminator gets sprayed with that stuff it turns into a puddle.
As far as strength goes, the Alien queen seemed fairly evenly matched with the dock loader at the end of the second film. That dock loader is built with tech several 100 years ahead of the t-800, who was designed by a computer after the world ended in 1997 (so probably one running windows 95).