Not a free-drive simulator
In case if you dont get it from store page
this games is about A-to-B routes. Yes, it still simulator, but with limitations. No own company, just score-based levels. Not so much content. For that - not a bad game.
Main series - simulators. And every game have own features not included in prev\latest. So maybe better buy whole series at discount. In that case not matter how good ET2 as separate game.