mediocre

• second-rate
• a project; a programme
• not professional

amateurish

• not done to a professional standard
• second-rate
• a project; a programme

enthusiastic

• keen
• not done to a professional standard
• second-rate

appalling

• terrible
• keen
• not done to a professional standard

flawless

• perfect
• terrible
• keen

outstanding

• exceptional
• perfect
• terrible

state-of-the-art

• (of technology) most modern
• exceptional
• perfect

melodic

• tuneful
• (of technology) most modern
• exceptional

remarkable

• noteworthy
• tuneful
• (of technology) most modern

dull

• boring
• noteworthy
• tuneful