Part of it is bias. I notice people tend to be preconditioned to hate on Bellator because of the sentiment on forums like this one and r/MMA. For example in the reddit thread people whined about the pacing over and over again when it literally had the same pacing (1 fight per 30 minutes of broadcast time, if a fight ends quickly they have to fill time) as the UFC card that just ended.
That being said it's not all bias. Part of it is the big, round cage. At 35 feet it's 5 feet bigger then the big UFC cage and 10 feet bigger then the smaller, Apex one. Part of it is the fact their roster is weighted towards less exciting fighters. The reason why that's the case is that UFC builds it's roster around excitement which means the divisions are very striker heavy. Bellator doesn't have this luxury so in order to collect world class talent sometimes they need to look at guys with less exciting styles. It's this reason amongst others I regularly encourage people to re-imagine what being the dominant brand in the space truly means.
I thought the card on Saturday was pretty decent myself, I don't really get why people are saying it sucked tbh. Yoel/Davis had 2 good rounds, Gracie should have been matched tougher but he got an over matched opponent out of there quickly, Bennett/Lara wasn't the highest level but was decent action, Georgi/Rogers had it's moments and Ben Parish had one of the biggest upsets of the year. Not card of the year, but not the worst either.