The ECB has been lagging behind other central banks in the last 4 years when it comes to printing money, but that is set to change now. The Euro has significantly lost value against a lot of currencies that would be deemed strong currencies, like the CHF, NOK, AUS to name a few. The reason it hasn't fallen against the USD and GBP is due to the fact these currencies are embarking down the same road; it's like a beauty contest in reverse, they're all trying to devalue more than the other.
When you measure all these currencies against the oldest currency of human kind, i.e. gold, then you will see that they are all losing ground and becoming less valued. Trying to figure out whether the Euro is more valuable than the USD is like trying to figure out if manure is more valuable than dung.