Good because it’s probably anti-oligarch.
Bad because Kolomoisky was very anti-Russian and this creates a power vacuum.

Last month, Kolomoisky’s people armed themselves and seized some offices of Ukrnaftogas which owes money to Kolomoisky’s gigantic bank — Privat Bank.

See the Bloomberg article for details.

Poroshenko assumes responsibility for Dnipropetrovsk region after Kolomoiskiy’s resignation
http://www.unian.info/politics/1059734-poroshenko-assumes-responsibility-for-dnipropetrovsk-region-after-kolomoiskiys-resignation.html

http://www.bloombergview.com/articles/2015-03-20/ukraine-s-oligarchs-are-at-war-again-