No, finasteride is good, it's just that dutasteride is better
5mg finasteride inhibits Test -> DHT conversion by around 75%
0.5mg dutasteride inhibits Test -> DHT conversion by more than 95%
This is because duasteride inhibits both types of 5AR, whereas finasteride only inhibits one type (albeit the main one). So at any dose, finasteride can only inhibit Test ->DHT conversion by a maximum of around 75% (as opposed to dutasteride achieving an almost complete inhibition of Test -> DHT conversion)
I use dutasteride & it rocks!
(It works well with nizoral shampoo & topical spironolactone cream for the real hair paranoids out there!)