Most hater arguments are weak. Get used to it, or you won't last long here(or any other forum, for that matter)
Weak era is just a way for Fed haters to diminish his achievements.
Another example of this fallacy, which happens in a lot of sports, not just in tennis, would be this NHL example.
Take this draft year for example
1 1 Quebec Owen Nolan R Cornwall Royals [OHL] 1200 422 463 885 1793
1 2 Vancouver Petr Nedved L Seattle Thunderbirds [WHL] 982 310 407 717 708
1 3 Detroit Keith Primeau C Niagara Falls Thunder [OHL] 909 266 353 619 1541
1 4 Philadelphia Mike Ricci C Peterborough Petes [OHL] 1099 243 362 605 979
1 5 Pittsburgh Jaromir Jagr R Kladno [Czech] 1346 665 988 1653 937
1 6 NY Islanders Scott Scissons C Saskatoon Blades [WHL] 2 0 0 0 0
1 7 Los Angeles Darryl Sydor D Kamloops Blazers [WHL] 1291 98 409 507 755
1 8 Minnesota Derian Hatcher D North Bay Centennials [OHL] 1045 80 251 331 1581
Many unintelligent Quebec, Vancouver, Detroit, and Philedelphia fans would say something retarded like we should have drafted Jagr. Canuck fans especially would say Nedved is a weak pick, but they would be completely ignoring the two huge variables involved. One, the Canuck organization was horrible and Nedved could have very well been awesome too if he played for a better organization. Two, and this one is major, Jagr played with Mario Freaking Lemiux. He could have been drafted 29th and still would have ended up as the best player in the draft regardless of what his actually ceiling was.
There would be hardly anyone outside Canada/USA who understand a word of this.