I actually kinda like monero, but there are a few possible problems people have with it.

1. Tail emission. This is probably the biggest problem maxis have with monero, I think it's overblown, it's a constant tail emission, not percentage based.

2. Verification of the actual number of coins in existence. One can't see the balance of accounts, so one can't verify this. Again, I don't consider this a huge problem, as this is also true of gold. However, maybe there was a pre-mine we don't know about.

3. Tribalism, fear, etc. They're heavily invested in Bitcoin and don't want any competition. I think there is space for a few different coins, Bitcoin probably always being the biggest, but Bitcoin and Monero are complementary until Bitcoin has a very fast, cheap, high tps and private layer 2.