I too had a pile of Dark coin. It was just thinking through all the "features" of Dark coin that ended up leading me away from it. My main beef was a lot of the features look like either compromises or attack vectors to me. When I saw Monero what I saw was a clean simple cryptological platform which only tried to do one thing differently than Bitcoin. Since that time I have seen it improve in all the areas that are different than a typical scam coin or even something that is just hyped. Solidified codebase and cleanup (needed), block frequency (1m to 2m) changes, research into the possible weaknesses of CN (MRL), increased privacy (Shen), new database structure (LMDB). Zero hype. Zero flash.
Currently I see the two biggest detractors of monero being:
1. Single(ish) point of BTC/XMR exchange failure
This one is mitigated somewhat by the options that exist, but currently Poloniex is too much % or Monero trading.
2. Cryptography that is less tested that Bitcoins
Like everyone else I want to see a nice functional GUI. But that is still pretty far down my list. That said, this would be a pretty good time to welcome the masses with a shiny, easy to use GUI.