Don't blindly trust google reviews.
There's agencies which anyone can pay to boost the review space with fake reviews.
Avoid those doctors who only sits on their private clinic and maybe some lesser known private hospitals.
My suggestion will be to search on practo (don't trust their reviews also)
Narrow down the results by 4 star+ reviews.
Now look which doctor sits in a reputed hospital (like apollo, fortis etc).
Now cross verify the reviews from other medium like google.
Then make your decision.