I think this will largely depend on what the opposition your players will face looks like.
If you're pitting players against PR0 and PR1 mooks, then lower dice pools are fine (opposition is 2-5, so players should be 6-10 if you want them to beat them consistently).
If your intending to run them up against beat cops and eventually SWAT, they'll want higher dicepools (opposition is 4-9, so your players will want 10-14 to again beat them consistently).
There is no right answer here, only what your table is aiming for. If you want them to struggle, have them have similar or even lower dice pools as expected opposition, forcing them to run if confronted.
I personally have no problem with one or more attributes at 1, as long as the players are expecting to be challenged occasionally. If a player of mine considers his character to be virtually incapable of lying, expect him to run into a cop at some point who's got some questions.
That being said, I know some tables are opposed to dumpstats, and that's fine too. All that matters is that you find a balance with your players.