Okay, let me throw my two cents in here about Microgaming slots. I've been playing them for years, and I've got to say, they're hit or miss. Sure, everyone knows Mega Moolah - it's the poster child for progressive jackpots. But let's be real, your chances of hitting that are slim to none. I prefer games with a bit more meat on their bones in terms of regular gameplay.
Personally, I'm a huge fan of Immortal Romance. Yeah, it's old school now, but the features are still top-notch. The Wild Desire feature can be a real game-changer, and the Chamber of Spins bonus round is probably one of the best-designed bonus features out there. Each character's free spins round feels unique, and it keeps me coming back.
As for Game of Thrones, n0n1ck, I hate to break it to you, but you're not alone. The RTP on that game is atrocious. It's sitting at around 95%, which is well below what I'd consider playable for a modern video slot. You're basically paying for the brand name and cool sounds. If you want a fantasy-themed game that won't eat your bankroll quite as fast, give Dragonz a shot. It's cute, it's fun, and it's got a much more respectable 96.3% RTP.
On the casino front, I've had good experiences with Jackpot City for Microgaming titles. Their game selection is solid, and they seem to get new releases pretty quickly. Just remember to read the terms and conditions carefully - their bonuses can be a bit tricky to clear.