The basebuilder game is, unfortunately, something of a bygone genre. They were once among the great titles of PC gaming, but, for once reason or another, didn’t keep up the mainstream popularity to the present day. Therefore, when discussion about the best titles in the basebuilder genre comes up among PC gamers, the most highly praised are usually, to this day, still older classics. Some exemptions to this rule of thumb do exist (usually among the indie scene, if anywhere) but it’s largely nineties to roughly ’05 cult classics or bust.
Of those cult classics, of particular note is the 2004 Elixir Studios release Evil Genius
Cult classic Ken Adam-esque staregy basebuilder in which you plot world domination from your underground lair. Story and humour fine. Novel gameplay mechanics good. Art and music great.