I really like OpenXcom, but like the original Xcom i can't play it because of its rather stupid hit calculations. Range to the target isn't used for calculating the chance to hit a target. Because the troops can't hit something when it stands in front of them. Resulting in funny battles.

There is an build-in mod to reduce the chance to hit a target based on range. Since this doesn't solve the issue, the melee aliens become even more dangerous. And from all games around, Xcom do have the nastiest melee alien ever.