Couldn't disagree with that more.
http://www.baseball-reference.com/players/s/soriaal01.shtml
He hit over 30 HR three times as a Cub, including 2 years over 100 RBI's, one a career high.
Did the Cubs get what they were paying for out of Soriano? No. That's what happens when you sign star players to big contracts via free agency, especially guys that are 30+ when you sign them, but let's not pretend that Soriano was worthless in a Cubs jersey and didn't have any good years.
I expect more or less the same out of Lester - maybe not as good as when he was last year, but I'm sure the Cubs will still be better with him than without. I'd say last year was an anomaly for Lester, with his ERA being around a full run lower than he typically produced. That's the only thing that concerns me.
Lester was 16-11 last year with a 2.45 ERA and over 200 K's. Not sure what you see that's wrong with those stats. W/L record can also be deceiving when you play on a crappy team.