Houston was passed over 60+ times. Are you questioning every GM that selected a player in front of him that didn't pan out? Houston dropped because of drugs and character. He worked out but could have just as easily been a Randy Gregory, who also dropped because of drugs/character. Btw, Housler was drafted prior to Keim being named GM.
Overall, I think Keim's draftS have been very good. Humphries, Bucannon, Mathieu, Johnson, Brown, Nelson, Gunter, Minter, Golden, Ellington, Stinson, Okafor, Watford , and Taylor have all been players/starters/contributors on a very good team. Also Walter Powell has been playing well for, I think the Jets.
Excluding last year, because it's to early, Keim has hit on 5 of 7 picks in '15, 4 of 7 in '14, and 6 of 9 in '13. I know you want them all to be superstars but these are starters and guys you build the depth of your roster with and he has had a very good ratio to hit miss. Especially when you consider the Cards have one of the more talented rosters in the NFL.
Also, I didn't count Cooper or Niklas whose careers have been derailed by injuries or his % would be even greater. In fact, the longer I'm typing the more ridiculous it is that Keim's drafting is even questioned. I guess if you want to focus on the Logan Thomas pick, then go ahead.