the most common complains you read about the mk1 is that it can’t do basses and it can’t do pad sounds well. There are two big threads here with many tips and examples that prove that it can do both well (of course pads only with 4 note polyphony).
But I (and many others) think, that it’s not a synth with sweet spots all over it. You have to spend time with this synth, find its sweet spots, learn its behaviour and some cool tricks. There are many workarounds for certain things. But in general, it sounds like an A4, with its own character and huge versatility
Aaand a big bonus, where people all seem to agree. It can do amazing analog drums