(1) I have had quite a few lucid dreams which felt very real to me. Yes, Depending upon dream intensity the realism of dream varies. Some people claimed that high intensity lucid dream look more real than reality itself. The good thing is, once u learn how to stay in a lucid dream u can increase the intensity through will power and affirmations.
(2) I have communicated with quite a few dream characters. For this again, U have to use your intention plus will power.
(3) Talking to your Subconscious is like talking to any other dream character as each dream character is a part of your subconscious. Again, will power and intention. In fact, Talking to my subconscious is one of my primary goals. I tried it when i lucid dreamt first. But before i could invoke my Subconscious mind, my excitement got better of me and i woke up.
(4) I have never experienced WILD. For me, most lucid dreams are induced through a combination of Autosuggesstion, Subliminal Messages, Meditation, WBTB and Lucid dream Pills. But once practised, WILD becomes easy.