I'm sure it's fun to play, but it's not really fun to play against. It's a very linear deck that you either can or can't deal with from the get-go. Of course it's not helping that I'm playing a Simic deck that mostly just goes wide. So I've got almost no removal for Ram (or Colossus), I can't go taller than Ram, I can't go wide because of Gates Ablaze and I can't out-value Guild Summit. All I can really hope for is that they don't draw Gates Ablaze on time (fat chance with the kind of card draw they decided to give gates) or I can draw the couple of counter spells I do have before it's too late. Or that I can get cheeky with Hadana's Climb or something.
Edit: Tho I must admit that my sideboard is still really lacking, and I could make the match-up much more manageable with some changes in there. But at the same time I have already spend more wildcards on Simic than I'd like.
If you want to keep simic, then consider packing some counters in the form of Frilled mistic mainly, as they will be a much needed beater as well., also Incubate/incongruence is a ways a good card in my experience as it will help with the collosus and ram or help you find the carnage tyrants you should be playing on turn 4-5.