I thought they have been holding back a bit on Thor's might in the name of team building, to allow other Avengers to have a role and not have him be so powerful he wouldn't need them. But he's getting more powerful all the time.
His best feats in the MCU:
- Taking on a whole army of Frost Giants and practically beating them himself, while destroying a large part of the planet - then flew right through Laufey's monstrous 'goat' just for giggles.
- Hitting an Aether-powered Malekith so hard the Earth cracked open around them and shockwaves shattered windows.
- His punches can stagger Hulk; with mjolnir he knocked him flying.
- Despite accidentally giving Iron Man a 400% powerup, took no damage or was staggered by any of IM's attacks on him.
- His lighting took down a few Chitauri leviathans at once, and split open the Sokovia meteor.
A lifting feat would be good; we saw in the first Avengers he seems able to match Hulk's strength. But when you have such an awesome hammer, it's hard not to lead with that.