I see this discussion a lot. Figured I'd poll it. Some say he was, others say no.
For me, I say yes, because I thought he could have fought Thanos a lot better. He pretty much had low agility and although I wouldn't say he was any weaker strength wise, he definitely lost mobility and didn't incorporate flight or lightning strikes at Thanos at all. In Infinity War he was much more agile, and he seemed more powerful to me at least. I think if you give IW Thor both weapons he would have faired much better hypothetically. The way Cap gained the upper hand is the way Thor would have too but maybe even better. That's all I'm saying.
But then again, Thor has always been more powerful than the MCU has ever really portrayed him.