I really don't like it, because I do think user reviews can be very helpful. Especially for a lot of smaller PC titles, as more mainstream games media just don't cover them (regardless of quality). Also as Steam requires you to actually own the game and shows playtime in the review, there's an algorithm that notices review bombing etc. I still find Steam user reviews largely useful, even though there are some titles that have been review bombed. Also I really don't think giving "not recommended" to a broken product like Arkham Knight can really be considered review bombing. Unless people made an cordinated effort to buy, review and refund it. Something like in example giving "not recommended" to older Metro games because Exodus didn't launch in Steam at first, is review bombing and absolutely fucking stupid. I'm not a fan of Epic timed exclusives, but it does nothing to hurt the actual game. So review the game on it's own merits and take your issues with EGS to Timmy.
I really also don't buy the claim that review bombing is the ONLY way for consumers/players to be heard. There's so many ways to give feedback and share information to fellow gamers, that sabotaging useful consumer tool like Steam reviews is not needed at all.