The Smiths were unique and very special, but that's over! Morrissey as a solo artist has made some terrific songs. The single is now dead, the days of million selling singles are over. You need a few thousand to hit the top ten these days.
But to answer your question, the solo singles have been poor choices.
I thought that the single as it used to be is dead, but that individual song sales are big- instead of a big chart topping single hit, the industry is finding that people are buying just the songs that they like off of an album- treating like a menu rather than a pris fixe. I'm hoping to see Morrissey let go of the old single sales and radio airplay business model and embrace some new ways of looking at things. The internet has ruined the music industry as he knows it, but there are new opportunities that weren't possible before.
People don't want to be told which song they are supposed to like next- let them pick the songs that most appeal to them. The effect is that sales would be spread across the strongest few songs on an album, instead of concentrated on one. It's got to be frustrating and irritating to everyone in the industry who is used to the old ways. Maybe someone needs to compile sales data differently- an act would get credit for any sale from that collection, or album, of songs. So the charts would read: "Morrissey is in the #4 slot this week with downloads from his new collection, ROTT. Top sellers were Youngest... and You Have Killed Me."
I would love to see him produce a multimedia exclusive, with his songs, videos, and other artwork in some kind of interactive presentation. That could be exclusive to hard copy CDs and would drive listeners to collect a variety of formats. First you download the inexpensive MP3 tracks, released on an accelerated schedule but staggered, then finally a few weeks or months later the deluxe edition would be available, with additional material like printable liner notes, etc.
Is anyone really taking advantage of ideas like this yet? Bonus video tracks on deluxe edition CDs are just a novelty, aren't they? I don't buy a whole lot of music, I don't hear much that I like.