Start with what makes a good president? Obviously there's the issues and all that which people focus on, but that's subject to debate. Objectively, some qualities are definitely good, like being good at both urgent and non-urgent decision making, good at managing/organizing/handling chaos, capable of outsmarting adversaries, being a unifying force rather than a divisive one. Just to name a few. So let's look at those:

• Decision-making: She's relatively young compared to recent presidents, definitely a bit more in touch with modern reality and less tied to the old ways of doing politics. She's faced a tough choice with her running mate, and while Walz has been criticized by some, given the short timeframe it's clear she at least didn't fuck it up. Her debate prep clearly succeeded, and she's avoided any scandals despite clearly Republicans trying very hard to find them. All of these show a record of decent to good decisions.
• Managing, etc Obviously her campaign started in the midst of chaos, and there were a lot of fears regarding that transition. And it went probably better than anyone expected, with everyone quickly gaining confidence in her.
• Outsmarting adversaries She did a better job at this in the debate than any candidate in my memory.
• Unifying force Again I'll refer to her getting everyone behind her after Biden dropped, while also keeping Biden's support. Don't underestimate how unlikely that seemed before it happened.

I'll avoid comparing Trump who is obviously severely deficient in all of these respects. But I could go further and say she obviously compares favorably to Biden too, and compared to Obama, I'd give her an edge on outsmarting adversaries and managing, and Obama probably gets the edge on the other 2. But we'll see.