That's a simple list from Pro-Football reference for WR's since 1990, and their stats for the first three seasons of their career.
Mike Wallace sits 6th in yards, tied for 7th in TD's, 2nd in ypc and 13th in ypg.
He outproduced Megatron,Larry Fitzgerald, Andre Johnson and arguably Terrel Owens.
I won't say he's better than those guys, they are all bigger receivers and size matters. But yards and TD's say Mike Wallace is a top receiver, and has had a phenomenally productive start to his career.