I think most people are all up in arms about Beth because her death made a half-assed story arc pointless. The season started off SO strongly with Terminus, but then the Termites were killed off in 3 episodes in order to answer the hyped up question, "Where is Beth?"
There are so many unanswered questions about this hospital arc. Who the heck was actually in charge? Dawn? If so, then why was she forced to answer to others? Did they provide the house with food in season 4B to lure Daryl and Beth? Why do they hit people with cars and waste any of their medical equipment in the first place? Why do some of the cops go out of the sanctuary and risk their lives like that (especially if it's all about "the greater good" as Dawn and Hot Fuzz stated and about repopulation)? And most importantly, why did the show hype up and promise a "new" Beth Green when she died because of a stupid and rash decision that could have very well ended in a big shootout? In hindsight, it wasn't Dawn's fault. Beth's death was actually Beth's fault.
This story arc was dumb. And with Beth's death, it definitely became a waste of time because none of the unanswered questions will be answered.
They should have just tied her kidnapping with Terminus somehow, and the group discovers that she's dead and that she's become food. Would have been a chilling reveal to say the least about the Termites. I would have been completely happy with season 5A's focus being all on Terminus/the Hunters.