First game is unsurpassed, I have to say.

Unparalleled atmosphere, as far as I am concerned. Truly a great game. Played
Cataclysm [the spin-off] and liked some of the additional features, but it never
really felt the same. Only played the demo of the sequel, and some of the
changes irritated me, along with the lack of that aforementioned atmosphere,
so never thought to buy it.

The first, however, simply excellent. [Never one to take up the rose-tinted
perspective, me, no.]