I can't say I disliked the episode, it was necessary in my opinion.
First off, its one of the last times we see chipped Spike as he was, without him going crazy. I thought it was kind of sweet how he wanted to help in his own way, the only way he knows how, at this point he's still just a vampire with a chip in his head and a crush he probably doesn't understand himself.
I liked chipped Spike probably more then the other Spikes,don't get me wrong he was awesome when he was just evil, and he did a really good job as soulful Spike, but I enjoyed his chip-period the most, because the character was so conflicted. The writers and James did a great job playing that factor. Plus its funny!
Also the episode is a great turning point for the nerds, its the first time you actually see them do something truly evil and Warren's, Andrews and Jonathan's roles withing the trio are defined henceforth. Before Dead Things you just had 'The Trio', Warren turns evil, Jonathan is obviously torn and Andrew, well..., for the first time he's just really Andrew, the way we know (and love?) him. It adds a lot of depth to the three nerds as individuals, yes even in Andrew's case 😉
The fact that Katrina was chosen as the victim was well thought of, imho. It would have been less interesting and maybe less grave if it were someone we didn't know...She was just the right person in the right place at the right time, script wise I think... or if you look at it from her vieuwpoint, the wrong person in the wrong place at an extremely wrong time... ^.^'
I understand why some people might not find it entertaining per se, but plotwise, I think the episode is pivotal, building bridges with the rest of the 6th season's course of events...