I ditched Miracle Rogue because it's kinda hard to make it work with no Preparation. I still won around 55% of my games w/o them, but I just don't want to go through the stress right now lol. Working on a different concoction for Rogue now. If that fails, I'll just go midrange/tempo like everyone else :P
I'm maining tempo rogue right now. I have like five different decks atm I think, and tempo rogue is the only one that has remained consistent for me throughout the ranks. It has a disgustingly good matchup vs. zoo, which is fantastic because zoo is literally everywhere, and its only matchup that isn't very good is hunter rush. But if you can manage to get out an early Chillwind Yeti and keep your board relatively low on minions, you can still win it. Tempo rogue is also my favorite deck anyways because rogue is the coolest class.
About the arena stuff, I'd recommend figuring out what works best for you and only really deferring to Trump and Gnimsh's lists when you're really unsure. Watching Trump helped me get a lot better at arena, but I didn't get good at it until I left that shit behind me. It's really important to know which class cards you almost never want to pass up (Backstab/Eviscerate for Rogue, Unleash for Hunters, Flamestrike/Fireball/Polymorph for Mages, Swipe/Druid of the Claw for Druids, blah blah), and it's even more important to make sure you have a solid curve. I eventually started to pop up a pastebin while I drafted and listed out each card I got by curve, a la:
1 - Worgen Infiltrator
2 - Novice Engineer, 2x Acidic Swamp Ooze
and then I'd list my spells separately at the end because they rarely fill out your curve early-game, exceptions being like Power of the Wild and Animal Companion.
That helped my win ratio a ton because I always had a list of what cards I'd drafted while I played, so in any situation, I could glance at the list to figure out what cards I could potentially draw that would affect my plays for the next turn. Plus, it made it a lot easier to draft a good curve.
The only other suggestion I have is to avoid shitty classes. Warrior and Priest are probably the worst classes in arena because their hero powers and their class cards are kinda crappy. Warrior weapons are great, but if you don't get enough of them, it'll be hard to keep up tempo in the early to midgame. imo Rogue/Mage are the best because they have excellent class cards and because their hero powers directly affect the board, which means you always have some kind of option to help make advantageous trades.
Oh also craft preps if you want to play miracle rogue. They're huge game changers once you get your Gadgetzan out, and they basically draw you 2 free cards each.