Andy's songs aren't bad. But, no offense to Andy, in my view they were the first signs that Morrissey would accept a mediocre songwriting partner so long as he could combine him with a producer who could tweak the songs just enough in the studio to make them sound good, the end result being solid backing music for his vocals.
The album whose creation we have the most information about is "Viva Hate", and it's telling that Street talks about sending Morrissey a tape of half-finished demos that was well-received, yet Reilly says he wrote most of the songs. The truth is somewhere in the middle. Morrissey's method as a solo artist, it seems, is to take so-so songs and spiff them up in the studio under the direction of a good producer. I don't know this for a fact, but I'm pretty sure I'm right. Thus it's misleading to talk about Rourke, Whyte et al as co-writers. "Your Arsenal" is Mick Ronson's album. "Vauxhall and I" is Lillywhite's. "Quarry" is Finn's. And so on.
Does it make a difference if the end product is the same-- a good song? Not really, no. But I think it says something about Morrissey's philosophy about music and helps explain why some of the generic rock sounds on "Years of Refusal" are probably exactly what he wants them to be.