As mentioned many, many times before in other posts.... your console's ability to read pressed Playstation 2 games doesn't show that it's laser is in A-grade condition.
Getting older PS2s to read recordable discs puts a greater strain on the laser, and weak lasers might be unable to even read burned discs.
If you didn't use Verbatim DVD-R discs that were manufactured by either Mitsubushi or Taiyo Yuden, your PS2 might either wear out it's laser quicker or it won't even read those discs.
SCPH-10000 S. MINOKAMO v1.01 (Defunct)
SCPH-10000 S. KISARAZU v1.00 (faulty)
SCPH-15000 S. KOHDA (With warranty seal!) :D
DESR-5100 S. EMCS