I think the OP would agree that it was "early Asimov" but you can't blame the writing on that. The OP was making the point that his writing never improved.

Having said that there were cringeworthy aspects of the first Foundation book that improved over the subsequent books. I recently reread the series and came to the shocking conclusion that he must have been a virgin (or at least not exposed to women) in the first book.

"Search by the Second Foundation" (the second half of the book "Second Foundation") was one of the very last science fiction stories he wrote, apart from the spate of novels in the 80's.

It gets confusing because once he was famous, magazines would call him up asking for a story and he'd give them one that he'd written between 1939-1951 that had been rejected. They'd accept it because he was now a legend.

So Second Foundation, at least, is not early Asimov. It's arguably late Asimov. And it's exactly as wooden as the other parts of the original trilogy.

That said, I've read every bit of fiction he ever wrote and loved most of it, so...

His retcon from the 80's wasn't any better in terms of dialogue