spotty:

lacking uniformity especially in quality

spotty:

lacking uniformity especially in quality

(Adjective)

Example Sentences:

Ramayana:  Most English translations of the Ramayana are spotty; few do a good job at conveying the epic’s poetic beauty, emotional intensity and devotional depth. 

Mahabharata:  Bhishma pointed out that although Karna had a huge reputation as a great archer, his actual record was spotty: he had been overpowered by Drupada’s army, the Gandhavas and most recently by Arjuna at Virata.

Bhagavad-gita:  We may have phenomenal talent but if we don’t learn to manage our mind effectively, our actual achievements will be spotty at best.