I don't have any problems filtering through the reviews, no. I just scroll down the reviews, and check out both positive and negative reviews. I use the filter function to filter out those that have played less than one hour.You see a title getting 1000 user-reviews with 70 percent negative on Steam while 30 are positive....you consider reading through hundreds of user-reviews an "easy way to filter the bad from good ones"?
Or is there another way how you can spot them? Probably easier and faster than reading through probably several hundreds of pointless and crappy, completely valueless "rants" rather than "reviews"?
Yes, Steam marks times with potential review-bombing happening, but it´s about lousy/bad/pointless reviews happening on Steam and those are happen all the time regardless of any review-bombings happening and as a matter of fact, those bad/lousy/pointless "reviews" are not marked in any way.
I also check the discussion threads about the game if I am unsure of a purchase. And I also check how often the game if updated.