The vast majority of my internet blitz games are played on the Internet Chess Club's 3 minute or 5 minute pools. Occasionally, if I want practice with a longer game or if I don't have a mouse around for blitz, I will play in the 15 minute pool. Unfortunately, 15 minute games online have a couple of unfortunate factors.
1. Fewer people want to play.
2. The games take longer.
These factors both result in it taking longer to find an opponent and that opponent being unlikely to match your level. This results in an cyclical problem because people like me play less as a result, leading to more of factor 1.
When I do play, the games are often easy. Here's a fun one from a couple of days ago -