I have no problem with Rizzo but to me he is a player you have to look at with more then stats. He has some majors holes. Hope he gets them corrected o makes the Cubs a much better team.
The problem with allowing more than stats into the argument is that there's poor sample size and potentially biased opinion in either way. Regardless, there is strong reason to believe that this year is an anomaly. It's rather unusual for someone to have a low average with a high walk rate and average strike out rate. To put this in perspective of the 43 players with qualifying ABs and greater than 10% BB% this year, only Stanton, Uggla, Dunn, Smoak, LaRoche, Swisher, Chris Carter, Russell Martin, and Reynolds as well as Rizzo have an average under .250. And of those players, all of them are above 21.8% K% with about half being well over 25% where as Rizzo is at 18.4%. Those under 25% include Smoak, Martin, LaRoche and Swisher.
Swisher and LaRoche aren't terrible comparisons. Swisher's career BABIP is .291 and LaRoche's is .305. To give a little more of a sample size lets throw in some guys with similar career BB%/K% guys. Rizzo is at 10.2%/19.4%. Andre Ethier(9.7%/17%) has a career BABIP of .323. Prince Fielder obviously has more power but sits at 12.9%/17.5% with a career BABIP of .303. The aforementioned Freeman(9.6%/21.0%) with a career BABIP of .334. Josh Donaldson(9.2%/18.4%) sits at .313. So, Rizzo sitting at .258 BABIP really is that absurdly low.
I know your contention is Rizzo puts weak contact on balls. That's really difficult to debate because it's a judgement and is subject to sample size bias. For example, you may watch all the cubs games and various others on TV from time to time but you're not watching every game played in the majors and certainly aren't watching every game over the past 3 years. However, I did try to dig into this as best as you can with stats. If you look at the batted balls for those players you will see that they all have around 20% line drives, 13% HR/FB and 6-8% infield fly with the lone exception of Fielder who clearly has a higher HR/FB ratio. As such, its difficult for me to say he's worse with contact than any of the guys above. If he truly were putting weaker contact on the ball you would expect his line drive% to be significantly lower than the rest. Additionally, you would expect his HR/FB to be lower as well as his infield fly% to be higher and that just isn't the case.
With that being said, the worst of this grouping is Swisher at .291 BABIP which would basically make Rizzo a .266 hitter with no other improvements but better luck with balls in play. Additionally, in that light his .310 BABIP last year doesn't seem all that unreasonable especially when you consider every other season(including minors) where he's had 200 PA's his BABIP has been no lower than .297.
That all leads to the multi-million dollar question, what will he be? If we can all agree that he's at least a .265 hitter which seems fair, I'd postulate his low end is similar to Swisher's peak years. I'd point to Swisher's 2007 season with the A's as it is on a poor line up though arguably slightly better than the current cubs line up. Swisher was 26 at this point so Rizzo would have 2 full years to grow into that.
Season Team G PA HR R RBI SB BB% K% ISO BABIP AVG OBP SLG wOBA wRC+ WAR
2007 Athletics 150 659 22 84 78 3 15.2% 19.9% .193 .301 .262 .381 .455 .362 122 3.9
Compared to Rizzo's 2013
Season Team G PA HR R RBI SB BB% K% ISO BABIP AVG OBP SLG wOBA wRC+ WAR
2013 Cubs 160 690 23 71 80 6 11.0% 18.4% .186 .258 .233 .323 .419 .325 102 1.6
The more difficult question would be what's his peak. I'll say mid 5 WAR. If you compare his past to say Freeman, Rizzo has shown the ability to walk more and strike out less and Freeman put up roughly 5 WAR this year. At 4 WAR he'd be one of the top 40 hitters in baseball and top 20 at 5 WAR. To be any better than that, he'll either need to figure out how to get on base a lot more(.300+ average or a lot more walks), drive in an absurd amount of runs(120+) and/or be substantially better on defense(not that he's bad now but he's not say Andrelton Simmons levels of good).
That's why the talk about Rizzo is difficult for me. The majority of the numbers are already there. His value is just lessened by the fact he hasn't been able to get on base as much this year and that directly relates to his BABIP. If he had hit .265 this year his line would probably look something more like 80 runs 25+ HRs and 90 RBIs which makes him a 3-4 WAR player depending on some other things. To me, all the things he needs to have a huge rebound season next year are here and that's before you even talk about him getting better with age. This all reminds me of Jason Heywards 2010 season where his BABIP was .260 and the next year he rebounds to have a 6.4 WAR season.