I truncated much of this.
The best thing about Furman's Unicron (in any series) is that the characters never treat him as a "seen it and beaten it". In both G1 and Armada, everybody freezes when they see Unicron and realize what it is-something fully capable of rending their planet asunder. Even without the psuedo profound mysticism Furman likes, that is pretty daunting. Furman's Unicron is not quite Stalin's Thanos and Warlock, but it comes close.
Chux has made a few mistakes in summarizing the Dreamwave years. This is understandable, as Dreamwave stumbles over its own continuity more than once. The exploding ship had more than one cause, depending on which series one reads. Characters appear in more than one place at a time, and have multiple origins. War Within was a guilty as any other DW book of this. War Within II was much better than the first, as it was more idea based, and relied far less on Easter Eggs to tell a story. The second Generation one series is also better than the first. For all of its continuity problems, it avoids the childish errors of the first series, especially the last issue. (The US does not have defense ministers, and our defense officials do not wear military regalia, nor do Canadian officials.)
IDW is ranging from pure fanwank to self-indulgent decompression. Other than the Shockwave one-shot, I can think of nothing worthwhile that IDW has published.