婉转地说软件不好，可以采用以下几种方式：
表达软件不够友好
"The software is not very user-friendly."
"It's challenging to navigate through the software."
指出软件功能不足
"The software lacks essential features."
"It doesn't offer the functionality I was hoping for."
暗示软件体验不佳
"Using this software is a bit of a chore."
"I find the software to be rather cumbersome."
表达软件不够人性化
"The software could benefit from more user-centric design."
"It seems to be missing a human touch."
婉转批评软件质量
"I've had a few issues with the software； it's not quite up to par."
"It's not as reliable as I would like it to be."
这些表达方式既传达了软件存在的问题，又显得比较委婉和尊重，避免直接贬低或攻击开发者。