I was listening to Leoš Janáček's opera Cunning Little Vixen. The score was rather uneven in quality to me. I found the instrumental parts most enjoyable but the vocal arias were weak. Maybe it was the performance but I was just a little underwhelmed by the uneven quality of the work.
Schumann was a genius who probably wrote better small scale works, such as solo piano pieces, songs, chamber music etc. But he wrote four great symphonies that often get overshadowed by other symphonies of his time.
In any case, which one(s) are your favorite(s)?