The present study examines the linguistic features of Korean college students' English writings in terms of their writing quality and genre. Forty-eight Korean college students took part in the study, and their writing samples, comprised of narrative and exposition compositions, were collected to analyze on the basis of fluency and syntactic complexity. A total of 95 writings were entered into the computer program L2 syntactic complexity analyzer (L2SCA), and then statistical analyses such as ANOVA and t-test were performed to investigate how the linguistic features of the participants' English writings are different depending on their writing quality and genre. The results showed that participants' writing quality had a statistically significant impact on the text length of their writings, while it did not have a statistically significant effect on 13 measures out of 14 syntactic complexity measures. However, the results of genre differences indicated that the genre of writing had a substantial impact on 15 measures including fluency and syntactic complexity in the participants' writing. Based on the results, some implications on how English writing instruction can better help Korean learners develop their English writing skills are discussed in the end.