RTS games you recommend?

Played absolutely lots of RTS games.
Winner is still Starcraft/Starcraft2

For single player:

• Starcraft 2
• Warhammer 40k Dawn of War 2
• Company of Heroes
• Command and Conquer 3
• Sins of a Solar Empire (grab the latest, Rebellion I guess)

Olders:

• Star Wars Empire at War
• C&C 2, C&C Red Alert 2
• Warcraft 3
• Battle for Middle Earth 2
• Homeworld 2

For single player, plain old Starcraft 1 and 2 are enough for me. (Yes! I'm Korean!) Though I did like Warhammer 40k too.

real time strategy isn't really my favorite genre, but I remember really enjoying Age of Mythology back when I played it.

Company of Heroes 1 with Bltizkrieg mod or Western Front.Simply the best.

Syndicate (1993)

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Natural Selection 2

Natural Selection 2

Not entireli a RTS but Kenshi is pretty damn good.

Dawn of War II Retribution

Total Annihilation

Ive heard good things about sins of a solar empire.

Starcraft II...

Already mentioned Red Alert 2. But you can also try the Stronghold series. Crusader most of all is particularly awesome. Warhammer 40k Dawn of War is good too. And of course, a game forgotten by many but extremely good, World in Conflict.

Age of Empires II

Original War on GOG. Great game still supported by the developers and the community (the third campaign is to be released soon).

Company of Heroes (also has few expansions that are kewl') & Company of Heroes 2
Red Alert 2 w/ Yuris Revenge
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Age of Empires (Any of them, II is very challenging but not really unique, while III is not as challenging as II but it is still difficult and you can play games with bots at expert for more than 1 hour. Play Carribean in Free-For-All and you'll see).
Empire Earth (Mostly the 1st or the 2nd one. I would recommend you the 2nd one, since the 1st one is more challenging in a bad way, but still fun to play. Also, II has territories. III is not that great, but you can check it out if you want).
Age of Mythology (Great one)

Emperor: battle for dune))) 2001 year, but it awesome

Company of heroes 1/2 and Stronghold Series

Hotline Miami or Skyrim

In my opinion Stronghold is the best Singleplayer RTS & Stronghold Crusader the best Multiplayer RTS. :)
Well.. Paraworld was great, too.