I'm certainly no fan of DHoward or Kobe. Each has problems with his game, and I don't fear either of them. But a team with Howard, Kobe and Nash is an automatic contender, and should be feared... meaning 'be prepared for the fight of your life.' It's not just the simple addition of sheer talent... it's that these 3 guys together add up to more than the sum of their parts... they tend to negate each other's weaknesses, leaving only a lean, mean basketball machine with very few holes.
Kobe Bryant's weakness is that he likes to dominate the ball, and he chucks, a lot, especially in crunch time. This is negated by: Nash, of course, who brings world-class leadership to the offense. Unless Kobe is nuts, he will certainly defer. Howard also helps by presenting a big, powerful target on the inside for some easy scores.
Dwight Howard's weakness is his limited offensive arsenal, his free throw shooting, and his childish attitude which has in the past led him to lose focus and professionalism just when those were needed most. This is mostly negated by: Nash and Kobe, whose veteran experience and powerful personalities should be able to keep Howard focused on the straight and narrow, to get the job done. And with both Kobe and Nash out there to manage the offense, we can expect Howard's offensive skills to be maximized. (Nothing external can help Dwight's FT%... so that's a flaw that remains.)
Steve Nash's weakness is his defense (though he's made an effort in recent years to improve it). This is negated by: Kobe and Howard, two of the game's best defenders. They'll probably pick up whatever slack Nash leaves in his wake.
Altogether... I hope this deal doesn't happen, because THAT team would be pretty damn formidable.
And the thing is: even though that team wouldn't last long, because both Kobe and Nash will retire one of these years... it would last long enough to present a very difficult and dangerous obstacle to OUR rapidly-aging Big Three (KG, PP, RR). Well... truth is, that "rapidly-aging" issue really only applies to one guy, but that guy is THE KEY to our success: Mr. KG. (Paul will diminish, for sure, but he's replaceable; KG is not.)
I.e., I'd rather not have another super-team out there challenging our potential domination over the next two years as KG works through his last hurrah for us. Is that "potential domination" real? Yeah, it's real... if we can stay healthy, I don't see any other team in the NBA as a clear favorite over us. The key is health... like it always is.