I think both repeater and WDS modes can potentially reduce the network throughput to half since both are store and forward based mechanisms which uses the same stream for storing and re-transmitting effectively reducing the actual throughput of the network.
Probably similar to the above post... but network throughput does not reduce. At least not for the networks on the AC router (I run 2 networks on it, 5 GHz and 2.4 GHz) and the N150 runs as a repeater to the 2.4 GHz (I run 3 networks, all with different SSIDs). Never had any throughput issues on the AC router even with this bridging. I probably need to test HD video streaming on the N150, but it primarily serves as a repeater and used only for ISP services to smartphones, tablets and laptops and for that it works very well, it includes a lot of video chatting on Skype, Facetime and Google Hangouts, tons of video streaming on YT and the usual social media. Video streaming for SD content (400 MB files) also works very well on it. HD video, probably not, but that's the reason I bought an AC router to stream HD video.
PS - My stressing on WDS is because the N150 is a pain to configure as a repeater wirelessly without WDS. It either needs to be connected via LAN (not an option to use with a router) or simply needs to be retired, as manual configuration for connecting wirelessly is a pain, in fact it is non-existent and also there is no firmware upgrade via DD-WRT or Gargoyle either. That said I was able to configure it as a repeater using WDS and with WPA2 security despite all the misinformation on the internet.