-- Use clairvoyance to sense a Jedi nearby
-- Fight competently with a lightsaber
-- Fly somewhat competently in a TIE Fighter
That's all fairly low-key for a space wizard. Vader can't teleport, or fly, or time travel. He can't blow up an X-Wing with his mind or predict the future in any practical way. In The Empire Strikes Back, they up the ante a bit. Vader uses the Force to deflect blaster shots with his hand (either that or they should make Stormtrooper armor out of his glove material). During the climax, we see his telekinesis is much stronger than portrayed before -- he's able to rip a heavy piece of machinery off of a wall and chuck it at Luke. That ability is apparently infinitely scalable -- Yoda uses his Force powers to lift a 15-ton X-Wing that had been firmly wedged in muck.