Kash was an extremely boring and at times extremely frustrating deck to play against(and still is) but it was manageable particularly when you knew most opponents would be playing it. It had a ton of tech cards that it was extremely weak against and they were ones that were generally good vs other decks like Talents.
It was a cancer but it wasn't even close to the tier 0 menace that was expected.

The splashability of its best cards was just as big of an issue if not more of one.