Polygon it's good as long as matic price is within $1, otherwise transactions cost around 10 cents. Same scenario with other chains, cheap as long as ethereum is relatively cheap or their native token. Which I think there needs to be work around for. Chain gets more use, token becomes expensive, transactions expensive as well, back where we started.
So far, the Polygon network has proven to be very cheap and still comfortable to use. But sometimes that's the case when it's overloaded. The denser the network (nodes) the more expensive the price, like a group of media journalists validating proof of game work in the field. I think we should make it a point to understand the characteristics of the assets you trade that also offer the lowest transaction costs.
Today, polygon is congested and when I make transaction it's asking 0.24 matic on lowest fee setting (using metamask) which turns out about 20 cents at current matic price of 86c. I'm used to paying couple cents, and this is expensive compared to that.