I played a match with Dissonance when I was trying to get a hold of the real basics (intuitive button-presses,) went with Tidehunter as I was told he's great for noobs, and went 0-14. Must have looked like I was feeding on purpose, everything I did was wrong. Item-buying, item-use, positioning, initiating, pushing, defending, ability-order, ability-use. All of it was beyond terrible. Genuinely would have been much more useful if I'd disconnected.
Tidehunter is easy to play but to hard to master type of hero I guess. I wouldn't recommend someone new to the game to play Tidehunter considering how crucial his ultimate really is during teamfight, unless that newcomer actually want to play as an initiator.