Here's a deck that's been performing beautifully. I developed it by taking Eon's Boros FiendStrike (R/W) and then steadily whittling and changing based on what was working consistently in 1v1 play.
I ended up with something far different, but it's a proven winner over many matches.
Some summary comments:
The basic game play is get a few goblins out, and start pushing through damage via shocking what they have out, goblin shortcutter, and/or by affixing maniacal rage to any creature.
This should allow you to start putting a lot of pressure on them - i.e. they should be below 15 pretty quickly.
This will invariably create a "let me get my biggest creature out now" response, at which point you hopefully can apply an "Act of Treason" and jiu-jitsu their creature for an attack along with whatever goblins you have in play. (Note: Myocloth is my favorite creature for this - they won't chump block with their initial creatures b/c they want to devour them to boost myocloth so initial damage is easy...then they drop an 8/8+ myocloth after devouring all their other creatures, and you act of treason plus your goblins...GG.)
Add in a raid bombardment or hall of triumph or a trumpet blast, and at that point pretty much no matter what they put out, the flood is unstoppable in terms of blockers and go for the win.
Even a board wipe by then is usually too late - that's what the skullcracks are there for, and even a shock or two to the face to end the game.
Make sure against lifegain to leverage skullcrack to prevent them from re-ramping life as best you can.
Right now this is my most consistent deck I have.
I'm going to test out a few more items - wrecking ogre addition, and maybe bushwacker, but otherwise I've pretty exhaustively tested things like Kiln Fiend, GutterSnipe, etc. and continuously refined to the fastest and most consistent creature set I could.
**Added: I simply added 2 Wrecking Ogre to the above (62 total) to make use of bloodrush and so far it's been an excellent addition. Few people expect a 1/1 to suddenly do 8 damage so it can greatly accelerate finishing off a game.
I'm also testing with 3 Pyromancer and there's a slight improvement in some cases due to the spawning, however, it can also slow you down since you don't want to attack with pyro in lieu of hoping to make more tokens. I reduced shortcutter (-1) and Denizen (-2) to make room. Not sure if that's a perm change yet.
Take the Flood for a spin and see what you think.