I understand why Sins and Requiem are collected here, but it does them no good to follow up Last Stand of the Wreckers.
Last Stand of the Wreckers is not Roberts' best work, but it's a great start for his long career on IDW's Transformers comics. Though not as good at character relationship's and action as MTMTE it's still a great miniseries and clearly the best one in this collection.
Sins of the Wreckers tries to go the same way as Last Stand, but overall feels like a lesser work. Despite that, we do get some interesting things about Springer and Impactor, along with Prowl being a bigger asshole and getting IDW's version of Tarantulas.
Requiem of the Wreckers is a middling conclusion; a one-shot rather than a miniseries, it makes an OK payoff to Springer's relationship with Impactor and Tarantulas, but the ending for both him and Overlord feels off, as if rushed to finish those dangling plots rather than organic conclusions to both characters.
Though I can tell that the lack of Roberts handling the writing in the latter stories made for middling sequels, overall this is still a strong collection and a must read for fans of the franchise.