Tell that to Kurt Warner and Jake Delhomme... or Jon Kitna, Jay Fiedler, Kelly Holcomb, Brad Johnson... or any of the other dozen or so NFL quarterbacks in the league right now who played over in Europe...
Yeah, like La'Roi Glover, Marco Rivera, Keith Davis, Brian Waters, Keith Traylor, Tom Nutten, David Akers, Adam Vinatieri, Dante Hall and Joe Andruzzi... LOL...
The TRUTH is, there are currently right at 190 players on NFL rosters who have played in NFL Europe... some of them are starters now, some of them are even Pro Bowlers...
Except there are no training camps going on while NFL Europe is playing their season... their championship game is in mid June, some six weeks before the start of camp...
It's pretty clear to me that you don't know jack about that league, that you have never followed it... in point of fact, the level of play is indeed a bit less than you'll find in the NFL, but it's somewhat better than even the best Division I college conferences like the Big XII or SEC...