Facebook has announced to change the algorithm of how relevancy is counted for ads. Now the system will give us ad relevance diagnostics across these three dimensions:
1) Quality Ranking: Your Ads perceived quality Vs ads competing for the same target audience
2) Engagement Rate Ranking: Your ads expected engagement vs ads competing for the same target audience
3) Conversion rate ranking: Your ads expected conversion rate vs ads competing for the same audience group and same optimization goal.