I was particularly fed up with the block themes that were being done, and it got to be more blatant than ever before with Mirrodin.
Skullclamp is one insane card, but it's not the only broken card in the block.
Mirrodin block may have done something more important, though. In Vintage, for the last several sets (every set since Urza's Destiny) few cards were released in each set that had the potential to be used in actual tournament decks. Even fewer actually managed to shake up the game. Onslaught managed to do something by releasing five exceptional lands (the fetchlands) and Scourge had some storm cards. But when Mirrodin came out, there was a barrage of playable cards hurled at the format. This continued to an extent with Darksteel and Fifth Dawn. I cannot remember and probably didn't learn all of the cards that made an impact on Vintage and other formats, but there were Chrome Mox, Trinisphere, Crucible of Worlds, Skullclamp, Disciple of the Vault, Arcbound Ravager, Sundering Titan, Mindslaver, Darksteel Colossus, Night's Whisper, Eternal Witness, Trinket Mage, Auriok Salvagers, Thirst for Knowledge, Chalice of the Void, Broodstar, Solemn Simulacrum, Pentavus, Goblin Charbelcher, and Krark-Clan Ironworks just to name a some.
Mirrodin may not have been the the most enjoyable of blocks, and it's not my favorite at all. But it is the most powerful block since Urza's, and has made a dramatic impact on the game. I can't really say I hate it. Would I have changed some things myself at the time, given the opportunity? Sure, but I would say so of any set in Magic's history.