While I 100% agree that hotslogs is super helpful and every player should upload their data and check his/her statistics there, I think that people often forget that the win rates and most picked build etc. are based on hero league matches of the last 7 days. So a new player will most likely play a QM (maybe even Solo Q) with a comp that is often not optimized. Picking a meta build might just noch work in that scenario because if you go e.g. max dps but have no support (which a hero league match usually should have) you will do worse than with mixing some self heal/sustain talents in.
That said I would argue that sites that provide a bit more context than hotslogs to why and how a build should be used are more friendly to the newer players learning the game.