First off, lemmie get this out of the way - 'Enjoy The Silence' is one of the most beautiful songs ever written.
IMO, Depech Mode's 'golden years' were between "Music for the Masses and Songs of Faith & Devotion". Violator still remains their all time top selling album. As a matter of fact, it's gotten played alot by me, lately, because I just bought the Rhino CD/DVD 5.1 audio re-release. Many people say "Speak & Spell" is their best album - It's not. Vince Clarke did not belong in DM - his songs stuck out like a sore thumb. Their first song that I remembered hearing on a top-40 radio station was "People Are People"
I was about 13 when MFTM came out. 14 when "101" came out, 15 when Violator came out - I'd never heard of them before 'Masses'... Violator is when MTV started giving Depeche Mode a good chunck of airtime. They had started gaining popularity in the US when MFTM came out, and it got a decent amount of airplay (radio and MTV) but Violator is what broke them out of the "120 minutes" part of MTV and put them in the mainstream.
I bought Violator the day it was released in March 1990, and I remember there being alot of hooplah about it. One - becuase the title of the first single (Personal Jesus) was pretty contrversal for 1989. It even remember MTV premering the video. Next up, came Enjoy The Silence. The song made them huge, and deservedly so. Then came 'Policy of Truth' while not near as popular as ETS was, still got plenty of exposure, and is my second favorite song on Violator. A few years later came "Songs of Faith & Devotion" and the first single "I Feel You" which didn't sound like the Depeche Mode we had all come to know - they started developing a more industrial/hard rock sound. While it was still a great album, it didn't have the strength ogf the all electronic DM, and wasn't around for very long.
"Ultra" and "Exciter", IMO, were both horrible albums. "Playing the Angel" is ok, but they've lost the sound that made them famous. Anton Corjbin (The artist behind the band, and director of many of their videos) is one of my idols.
"Sweetest Perfection" is about Heroin, if you ask me... During the late 80's/early 90's, it is widely known, David Gahan (The lead singer) had a really bad heroin addiction. Even though Martin Gore writes most of the music for DM, Gahans addiction was very obvious, at the time. I don't know if Gore ever got into heroin or not...