For the record, this is how I rate the formats:
2003-2004 Expedition-On: Blaziken was the clear cut best deck for a good portion of the season. Many called it dominating, but it still did not win U.S. Nationals or Worlds. Blaziken mirror match is also one of the best mirror matches the game has ever seen. Once Hidden Legends was released, prior to the three Stadium Challenges, the format saw a decent array of decks. There were virtually no donks. Very solid format.
2004-2005 Ruby/Sapphire-On: This season saw the debut of Fire/Red Leaf/Green, Rocket Returns, Emerald and Deoxys. All these sets had broken cards in them, such as Pidgeot, Blastoise ex, Electrode ex, Pow! Hand Extension, Rocket's Admin, Dark Tyranitar, Dark Dragonite, Medicham ex, etc. Zapdos ex seemed like a donk deck at first, but there were several cards that beat it down. The Worlds format was fairly diverse. You had Nidoqueen winning it all, with Spin Tail TTar right behind, several Medicham decks in the cut, Rock Lock, Dark Steelix and others. Solid format.
2005-2006 Hidden Legends-On: This season saw the rise of LBS, a new archtype in Mewtric, the greatness of Rock Lock and the staying power of Medicham. Unseen Forces added several key cards to the format, but it was Holon Phantoms being released later in the season that had a significant impact on the later events. U.S. Nationals was taken by storm by Delta and at Worlds, Mewtric prevailed over a very tough field, with Eeveelutions and Dragtrode making very strong showings. The format didn't have hardly any donks and had probably the most viable decks available in the game's history.
Great format.
2006-2007 Deoxys-On: We saw a lot of new decks this season, including Speed Spread, Empoleon, Infernape, Metalix, R-Gon and Banette ex. When Diamond and Pearl was released, Infernape completely dominated Battle Roads, causing people to metagame it at U.S. Nationals. A lot of players opted to just not play it. Speed Spread took both Nationals and Worlds. I believe this was a decent format, but things like Cessation Crystal, Crystal Beach and Windstorm made decks inconsistent. You either had to counter them or run them, taking up valuable spots. Many decks were also teched out. Donks became more common in the latter part of the season with the release of Diamond and Pearl. I personally thought this was a great format up until the release of Diamond and Pearl, but became mediocre afterwards. Decent!
2007-2008 HP-On: Last year's format. This seems to be a very unpopular format among many of you here. I believe to most great players, this was a great format. Yeah, believe it. While you had the least amount of viable decks all season in a long time, you had very skill-intensive matches. You saw very few, if any donks. There was viable recovery in Scramble Energy. You had long and drawn out matches. This even caused our time to be increased to 40 minutes at Worlds. This format did a lot for our game! More decks would have been nice, sure! But anyone who has any sense would take this over what we have had so far this season.
2008-2009: Now. Kingdra. Machamp. Ramparados. Gengar. Coin flips. Broken Time-Space. No real draw recovery. Constant Power Lock. I don't know where to start, so I'll just end this!