I'm going to disagree here, and before somebody pulls the "winning streak" overconfidence card (ahem), let me tell you this is after seeing both the Spurs and Lakers additions, and mostly how they've been playing all season long.
At this stage, either Gasol is pretty much the same problem. Actually, Pau just hasn't played as well this season, thus the trade rumors.
Bynum is clearly the Laker's best player, but they don't go to him nearly as much as you would think. The reason? He's still a fairly mediocre passer off double-triple teams. He is completely superior to ZBo on both size and strength, but he really isn't as skilled. ZBo has both that mid-range money jumper (which he was draining non-stop last night against Bynum/Pau) and he's a much better passer. So, Bynum definitely has the ability to dominate much more than ZBo, but as far as actually guarding and throwing a double-team their way, I'm not sure ZBo is the easier-to-guard guy. You also would need to add that Drew sometimes gets lazy. Take last night, 4 rebounds in 30+ mins.
The second problem for LA this season is the poor spacing they provide. A lot of teams pack the paint to double-triple Bynum, and largely it pays off. MWP is shooting 26% from downtown for the season (Memphis didn't bother to guard him in the perimeter last night). Kobe? 29% from downtown. Sessions just isn't taking many 3s, instead prefers to drive. Now, Memphis last season wasn't much better (I'm talking Conley, Battier who is now gone and OJ Mayo). But defensively there's just no comparison. Allen is way, way better one on one defender than MWP (MWP is still good roughing up players, but he's terrible running through screen). And Battier was way, way better than Kobe defensively. We're talking large margin here. Kobe these days likes to roam. He will literally leave his guy alone in a corner at the start of the possesion and go try to get a block or steal inside.
The third problem is their bench. As in, they have basically Barnes, who is middle of the road. Blake, Murphy, McRoberts. You can find instances just in the last month where one of the 3 finished with zero points, and the other two didn't even get to double-digits. Memphis just had a much better bench, especially when they had Battier. Their defensive intensity never dwindled.
The fourth problem is their coach. Mike Brown will literally enable Kobe to chuck his way through a game without even looking for his bigs, even though they might be shooting 60%+. The benching last night was an odd development, but since they have no bench, Kobe has to play. They just don't have enough to make up for even his poor shooting.
Their home record is also pretty deceiving. They've won a lot at home, but if you actually watch the games, there are very rarely any blowouts. Every team has a shot at Staples. Outside of Charlotte and Utah very early in the season most games have been within a 10 point margin. And they're a sub .500 team on the road. 10-15 this season.
All in all, I think this Lakers team is actually worse than last season. I think Memphis is also worse. I don't think they'll be a cakewalk or anything, but I think from a matchup perspective, both OKC and Dallas are more difficult foes, despite what the regular season record against us might indicate.