Just played a game on Goko and I sympathize with the OP.
The UI is pretty horrible, I would just wish there would be an option to play with a "pro" lightweight theme, like Iso's text mode. When I play on the internet, I just want a fast game to kill some time. It takes me forever to firstly find a game and secondly to play it.
I mean, I know I take this game too seriously and the loss of Iso would just mean I get to do something else with my time instead of playing Dominion. I for one will not switch to Goko.
Now I don't want to go hating on Goko since they clearly didn't have the "professionals" as their main target group, but more likely casual players who like Bejeweled, Fishdom and those sorts of microtransaction pits. I don't blame them for what they've done with the license, they're just catering to the largest group and/or the one that makes the most money. I'm just sad that because its existence it will be the only place to play online. It seems like they're genuinely listening to suggestions and trying to make what they have started with work for as many people as they can so kudos to them. Just not my cup of tea.
Oh well, time to find some real life friends again.