B.G 14.16
कर्मणः सुकृतस्याहुः सात्त्विकं निर्मलं फलम्। रजसस्तु फलं दुःखं अज्ञानं तमसः फलम् ॥१६॥
The outcome of virtuous actions is considered pure and untainted, while the outcome of passionate actions leads to sorrow, and the outcome of ignorance leads to darkness.
Gīta Bhāshya 14.16
The result of passion indicated as 'sorrow' in the context means a mixed bag of happiness and unhappiness, which ultimately leads to sorrow. But this is not as bad as ignorance.
'रजसस्तु फलं दुःखं' इति अल्पसुखं दुःखम्। तथाहि शार्कराक्ष्यशाखायाम्-
The phrase 'the result of passion is sorrow' conveys that it brings little happiness, which is also sorrowful. This is indeed stated in the Śārkarākṣya branch:
"रजसो ह्येव जायते मात्रया सुखं दुःखम्। तस्मात् तान् सुखिनो दुःखिन इत्याचक्षते॥"
"Limited happiness and sorrow are born from passion. Therefore, they call them happy and unhappy."
इति।
- stated thus.
अन्यथा दुःखस्य अतिकष्टत्वात् तमोधिकत्वं रजसो न स्यात् ॥१६॥
Otherwise, i.e. taking it to be extreme difficulty and only sorrow, would render passion worse than ignorance, which is not.