True; in fact mortality in 17th-century London was so bad that it required a net flow of migrants just to keep the population stable. Most of all, you were at much higher risk of plague during the plague epidemics.

But rural Europe was no picnic either - you would still be likely to die in all sorts of painful ways, from sepsis, diseases, accidents, childbirth, etc. And my god, it would have been dull.

Honestly, if you forced me to go back to the 17th century, I would probably take the risk and live in London. At least there is the possibility of crossing paths with Samuel Pepys, Christopher Wren, the early Royal Society etc. while you sit in your coffeehouse reading a freshly-printed news sheet.