Some basic difficulty and hash rate info at the two links below. I think there’s a source for the number of nodes, but can’t find it at the moment. I’ll keep looking.
In my view, nothing is “wrong” with BTC. BTC and XMR have two different use cases, but share some overlapping traits. The best attributes of XMR are ASIC-resistance, decentralization, privacy, fungibility…it’s private digital cash.