Although this service has a lot of negative review...

Although this service has a lot of negative reviews, I have had good experiences so far. Both deliverers are friendly and competent.
It may be that at the end of the chain (at the end consumer) not everything looks as perfect as desired, but you should keep in mind that the delivery person is only a link in this chain and therefore cannot always be held responsible for everything.

So I would continue to use the service provider dpd.