The 5 stars are mainly because after years, decades, of demand, GOG managed to rescue these games from obscurity, and they are back...not only that, while the Resident Evil trilogy added last year needed some fan fixes to run properly, this works perfectly out of the box.
About the game itself, if the first one was "Resident Evil 1 with dinosaurs", this one is "Resident Evil 4 with dinosaurs", after the mixed reception the original one had, Capcom made a straight-up action game...which is a lot of fun, and in my opinion, a better game than the original, a game that could become pretty tedious pretty fast.
Sadly, it came out in late 2000, when the PS2 was already out, and not that many people bought it, so while the first game gained a cult following, the sequel didnt, and a lot of people are not even aware of its existence...which is a shame, because this game is A LOT more approachable than the first one.
Whatever the case, support these games (both of them) so GOG can keep up the amazing job they are doing preserving these gems.