If you play with a keyboard, it felt bad because you didn't rebind your keys. Proper legacy mode setup requires swapping some keys around:
The biggest issue with Standard movement is backpedalling. Legacy mode is far superior to Standard where running away is concerned because you can run directly away from a target without having to take the time to turn your camera. However, Legacy strafing diagonally back still forces a backpedal, so to maintain its no-backpedalling behavior you have to rebind your legacy keys to use the Move/Turn keys instead of the Strafe keys. However x2, this then introduces the camera arcing that some people find disorienting.
There are two possible fixes. One is to stop the camera from arcing on Move. The other is to make the Strafe keys in Legacy mode function as direct Left/Right movement keys with no backpedalling.