Are you talking about the old Edge or the new one? The new Blink-based Edge is pretty good, and doesn't have the lingering incompatibilities of old EdgeHTML.

The old Edge to be fair. I don't think it is that bad, but the html engine would be the least of my concern. Only rarely do I create websites and Edge gave me no problems here.

I don't like its restrictive and opinionated settings. Some criticism has been adressed but I don't have an incentive to switch. Because I believe bad habits of MS resurface as soon as enough people do so. I have seen that it got better, but it just isn't enough. I don't use an online account for my OS because that would be silly, so some of its functions aren't even accessible.

Overall it just cannot be configured to my liking. It is usable, but certainly no Firefox.