I mean dude..... he's only 20 points, so that right there, is a huge incentive - I know a lot of people would sometimes go without any commander just to squeeze more out of their build.
But he also fits into EVERY build. Most other commanders have to usually be in a certain type of build that suits them best, but Dodonna works great in every build.
And he ALSO works even if your opponent hits an asteroid! And if you use Minefields!
Honestly I think he is one of the best commanders even if you doubled his point cost - so the fact that he is also only 20 points really makes me wonder why guys like Garm Bel Iblis were costed 5 points more.
The only other commander who is anywhere close to this level of amazing looks to be Jerjerrod when he comes out, and thats' mostly because of the revitalization he's bringing to so many Imperial ships, especially the victory - but he too, will fit into very many lists with ease, making Interdictors, Victories, and ISD's all significantly better!
Do you agree? Who is the best if you don't agree?