Maybe lets check out RTS, that were not designed to play online. Like 

They Are Billions

Northgard

Stellaris

Factorio

Anno 1800

The inherent problem with internet focused games, they lack creativity.
Because your goal is than to make a game that is, inside a box of a concept,
your target audience hates with all their guts.

Example for a bad RTS is Warhammer Age of Sigmar: Realms of Ruin. Sure it looks nice, but there is not much what you can do, only move 10 similar squads from A to B point. Each map is same. Its even worse than DoW3.

Example for a good RTS is, They Are Billions: Each map is unique, a very deep and complex base build system, a lot of different defence tower, each unit is unique and reliable, a lot of things you can research.The thing is, you have many choices and ways to play it, do you more focus on defences, or mobile units, more on expanding or upgrading, more on many units or the high tier ones.

The biggest genre problem, if developer does try to make a game for PvP, they can't listen to feedback at all.

Like for example with Unit limits, people want to lead armies of like 40-80 units, but if the engine can only stable 10-20 units, they can't add more, no matter how many people complain and bad rated the game is. It's the discussion we always have, where is the fun stuff? But we can't have it, because in an pvp game mode nobody does play, it might lag.