Powerline has too many drawbacks

I wanted to replace it with the adapter my weak Wi-Fi, which is already hard to receive 3 rooms (old building) on. Unfortunately seems PowerLine not suitable. The following disadvantages have bothered me:

1. The data rate is barely better than the weak Wi-Fi. Approximately 2MByte / s were possible, so not really much.

2. On my Logitech 2.1 speakers could be heard in data transmission over the power line a distinct rattling. Here the speakers are apparently not sufficiently suppressed, not necessarily 100% debt of Powerline. Still, it was very disturbing. While it would be possible to overcome a power strip with RF filters, while costing the again 30th

3. It was in my 3-day trial period 1x means that the powerline connection was torn off and I had both adapter and plug it in again.

For problems 1 +. 2 TP-Link can not, therefore 4 stars.