Thanks for being a jerk about it, but sure I can explain my feelings a bit more and include some positivity for you.
I think it sucks that Blizzard is constantly abandoning their cool ideas every expansion instead of fleshing them out in future sets. There are lots of cool mechaincs that have been brought out in other expansions that have had promise and then were summarily abandoned. They have said the C'thun cards are not going to be supported going forward, for example. I get the "lore" reasons why they do that, but given that its a card game and there isn't really a story, who cares? Publish a couple extra C'thun cards to fill holes in those decks or give them something new to do. Or they could make an Inspire card that isn't hot garbage. That sort of thing. It seems they are at least keeping Discover as part of the game going forward which is good IMO. I just hope they don't give up on the Tri-class stuff or whatever other new cool thing comes out in this expansion.
That said there is lots that I am excited for in MSG, the Tri-class cards and the Reno deck themes seems really awesome. I'm glad they are keeping the idea of Reno decks alive, even if they aren't going to be as good without Reno Jackson, I'll always have Wild to live in the Glorious permanent Reno meta. The Goons effect to buff cards in your hand is an interesting twist on the C'thun stuff, but it seems kind of hard to make work well, hard to say it will require lots of testing probably. The Kabal stuff seems more directly obvious how to use it (play a Reno deck), but I'm sure something cool will come out that makes use of the spells (dat Rogue coin so good). The Jade stuff is all TBD with only a couple cards its really hard to say, but historically that stuff has lived or died based on the presence or lack of a few powerful cards. I don't think we've seen those yet so I'll hold off.