I think people are overreacting.
1) In April, how many wins did you expect after adding Harper? I had them at 85-90, they're still on pace for 85 despite a horrendous string of injuries and a number of under peforming players, and that coming off 66 and 80 win seasons. The bullpen, Arrieta, Herrera, Cutch - that's a lot for a marginal contender to handle.
2) The hitting approach is not to take pitches, but to swing at your pitch (pitches the hitter can handle) with less than two strikes, instead of chasing pitches outside the K zone or making weak contact on a pitch in the K-zone. I think some players have struggled adjusting, but this is one of the talent filters, if you can't improve your mental approach to the game, maybe you need a new address (Franco).
3) The minor league struggles are partially some players just not being as good as hoped (Ortiz), but also a lot of aggressive promotions, testing prospects. One thing I noticed going through rosters, Klentak isn't drafting a bunch of 23-24 year old seniors to fill out rosters at lower levels but a lot of 20-21 JC and JRs - that will hurt performance but provide the chance to find a diamond in the rough.
4) It took a decade to dig a really deep hole for this organization, bad drafting, trading/losing draft picks and prospects, failure to aggressively pursue LA talent when money could be spent. I don't know if Klentak is on the right track, but I do know it'll take 3-5 years to turn the farm system around.
5) You can't buy your way into contention, you not only have to draft/develop well, you have to hit on guys "from the shadows." Klentak may have learned his lesson, spend big or not at all, that is, either target top players (and I'd avoid pitchers for the most part, Arrieta et al) or go bargain shopping - Smyly is a good example how you can get lucky if you buy a bunch of cheap lottery tickets.