Some players posses inhuman sniping skill, which amounts to "being seen = death".
And I am still convinced that even under normal circumstances the merc team is stronger when there is a game with 4 players who are about the same level.
Spies usually become strong when:
1. The server is generally laagy, even more so if the current host plays as spy
2. When the skills are not balanced. The mercs have less room for mistake, so if one of them is not as good as the other, the spies can focus on the weaker one. If you turn that over and have an imbalanced spy team, then the better spy can still choose where he goes, he has the initiative, which makes it less of an impact for the spy team to be unbalanced.
And I am still convinced that even under normal circumstances the merc team is stronger when there is a game with 4 players who are about the same level.
Spies usually become strong when:
1. The server is generally laagy, even more so if the current host plays as spy
2. When the skills are not balanced. The mercs have less room for mistake, so if one of them is not as good as the other, the spies can focus on the weaker one. If you turn that over and have an imbalanced spy team, then the better spy can still choose where he goes, he has the initiative, which makes it less of an impact for the spy team to be unbalanced.