The last good thing I remember Atari doing was Rollercoaster Tycoon 3, but they fell out with the developers, Frontier. So when years later Frontier and Atari go head to head on new theme park tycoon/sim games... avoid Rollercoaster Tycoon 4 and get Frontier's Planet Coaster instead. Atari cheaped out and went for the cheapest developers they could find, after going through two different developers they ended out with a mobile games developer... for what is supposed to be a relatively high-end PC Game... it did not end well. Planet Coaster meanwhile continues to go strong.
As Frontier goes, well before Planet Coaster had already made Elite Dangerous and since made Jurassic World Evolution and this November have Planet Zoo due to come out.