Likes and dislikes do effect your ranking results in search (not by a tremendous amount unless you get them in hundreds), they are counted as 1 whole in interactions. This means for example: if you released 2 of the same video, assuming no other factors were involved (like 0 views, 0 retention, etc...) just likes and dislikes, if video A had 0 likes 500 dislikes & Video B had 200 likes 0 dislikes, Video A would out rank Video B. Similarly if Video A had 250 likes & 250 dislikes and Video B had 300 likes & 0 dislikes, Video A would still out rank Video B. The likes and dislikes are effected even more depending on where they come from, Subscribers liking or disliking help boost the video a little more than outside likes or dislikes, this is according to Markiplier who stumbled upon this information. The most important thing to helping a video rank is Retention which is > Interaction. Favourites used to help videos heaps as well.