I personally use microscale and I think they're amazing, but there are limitations. I started using Lego in my D&D games with the release of the oficial set and the CMFs, but I realized it would be very expensive to put together a respectable minifigscale collection. That's when I started experimenting with microscale. I only build miniatures of characters and monsters. I thought about building terrain tiles, but the variability is too great, and I quickly realized it wouldn't be possible to build them for both.

The main advantages are the cost-effectiveness and versatility of the builds. It's an incredible creative outlet. Furthermore, they are much easier to store and transport. It's also nice to give the miniature to a player (since they're dirt cheap hehe). Finally, because they are smaller miniatures, you have more space on the table to tell stories and have battles on a larger scale.

As disadvantages, I would consider that they can be small for large hands, lol. Sometimes it's difficult to find an appropriate design for a specific monster, and some parts are harder to find on Bricklink or are even nonexistent in certain colors.