Time for a new adventure in Kanto
The visuals are kinda squary, an attempt to make the game feel like its old predecessors, but maybe that wasn't a good idea for a game that came out right after Ruby/Sapphire/Emerald, that brought screaming different visuals to Pokémon games if we compare them with Gold/Silver/Crystal. Now the sprites and graphics for pokemons are colourful and modern, similar to the ones from R/S/E.
The sounds is not so remarkable, but does make you feel like you're playing a Pokémon game.
The game lasts long enough to have fun, but of course, as any Pokémon game, things get really hot in the multiplayer. FR and LG come with a wireless adapter, that can be used to trade and battle instead of the cable Link, though the accessory is still accepted. There are, however, some mini-games that can only be played using the wireless adapter.
The replay factor goes to the old "gotta catch'em all", since that depending on the starter you pick, a different legendary will be available.
One way or another, Pokémon FireRed & LeafGreen are great games and no pokemaniac can miss them.