Meh I made this in 20 minutes, so C&C it.

Great slash fx

Trails should always overlap. The little trail when he just starts moving the sword looks out of place, and the tiny piece of trail at the end seems to be trailing in the wrong direction. The easing and force are good though.

Thanks, I just like to use the most effects as possible.

Quote from TehJynx

Thanks, I just like to use the most effects as possible.

this isnt always the best thing to try to accomplish. You should only use effects if your animation looks good without them, not to cover up things. If this isn't the case for you, then go for it :)