I ride a 2010 (2011?) aluminum Trek 2.3. It has 105 components and was a huge upgrade (for me) over the 1990s era fat tube aluminum Cannondale I had been riding before the Trek. I'm not a clydesdale, I don't race, and I don't really care about an extra pound or two or three of frame weight.
I do care about the components, though, and the problem these days with aluminum is that it seems to have moved decidedly down-market, such that you can no longer find aluminum frames with 105 or Ultegra level groups, at least not unless you build it up yourself, which I don't want to do. Thus my next bike will be CF, not because I'm dissatisfied with aluminum, but because I want 105 or Ultegra.