1. Cold Blooded. I don't care whether you prefer to run Toughness, or Scavenger, or Fast Hands, or even Hard Wired. You have the exact same counter the rest of us have, and we aren't struggling.
2. No peripheral vision. Since when has running in to someones sight ever been a good idea? Odds are if they're in a stationary position and you run out in front of them you're going to die anyway. Start learning to control your engagements and play more laterally.
3. Target Finder only assists with target location. Eyes are OP. Spend your points on something else.
The only group of players to whom I'd recommend the Target Finder are players that are not yet skilled in medium-long range target acquisition (Newer players), else all other sights are superior (ie. greater zoom, clearer etc.)