Personally, I am on the other side of the fence. I do believe that too many tubes is a problem. Have I heard all tube systems that sounded reasonably good? Yes. But most sounded even better once one or two components were replaced with SS.
In many cases, it depends on your listening preferences. I have friends with all tube systems that I think sound really, really bad (bloated mids, poorly controlled bass, etc.) that they just love. It also depends on the speakers. Some speakers just require much more juice than most tube amps can deliver. If you fall in that catagory, a neutral 200W+ SS amp mated with a tube pre-amp brings out the best in both.
Julian