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Depends on your definition of "strong". When going by physical strength, then yes all celestial mages are weak. They excel in controlling their magical power and sharing it with their spirits (someone with manga knowledge can probably come up with a better explanation). Controlling strong spirits isn't something that anyone can do and even more so two at once.
Although I share your view on Karen as she's the only one of them who couldn't control two spirits at once, Lucy and Yukino both have no trouble doing so, Angel less so since she had two "normal" spirits compared to two zodiacs. Yukino could also summon the 13th spirit with complete control which someone like (for example) Erza wouldn't be able to do. And while I'm absolutely no Lucy fan she is able to use Urano Metria which is a major power spell.
The main weakness of celestial mages is the user him/herself. No matter how strong your spirits are if the mage is knocked out it's all for nothing.
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