Widely regarded as one of the best Pokémon games, and I'm inclined to agree... In some aspects.

The upped challenge, inclusion of more double battles, and better mon variety were excellent. It adds way more endgame content in the form of the Battle Frontier, but I don't think it's all it's cracked up to be.

Half of the Battle Frontier is effectively luck-based, and that's just not fun. Losing a win streak as a result of a coin flip is artificial difficulty at its finest. There's a difference between hard and 'hard' after all.