1. Bad days... everyone has them. Some more than others.
2. If my friends want to play and they suck, I won't stop them. Please, go ahead and drop my KD by 2 points.
3. Crap-design quests (shindig in the crucible. Inb4 all the year 1 scrubs who grinded TLW in Y1 say "that quest literally took me 3 games hahaha!" No one cares, that gun is crap and the quest is shit).
4. not using OP weapons and/or subclasses (AKA- "crucible easy mode"- sunbreaker, pulse rifle, shotgun, prox. detonate rocket)
5. People who take some time to get used to PVP or coming back from a break, the first few games come out below 0.5 and that kills it for them.
Comment your own, I'll edit them in the post if i like them :D
P.S.
The thing that, in my opinion, defines a good player is SPM (Score Per Minute), and in a way grim score.
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6. Playstyle. A mediocre player may play extremely cautious and have a better k/d than a good player that play more agressive. For ex. The player that has 20 kills and 10 deaths with a 2.0 k/d is better than a player with 9 kills and 3 deaths with a 3.0 k/d.