I've carefully read the entire thread and considered arguements from both sides, and my conclusion is this. It all comes down to what your needs are.
First, let me get this out of the way for those defending the SP3's performance. I've been running benchmarks all weekend (I have to ship my SP2 by this week, so I've been trying to do last-minute comparisons), and you can't deny some of the valid complaints that opposition has- SP3 has worse performance than the SP2. It's not just schizoid paranoids (nor "trolls") hating on SP3. Other review sites are pretty saying the same thing (Anandtech has a great detailed review:
AnandTech | Microsoft Surface Pro 3 Review), and the SP2 out performs SP3 by a huge margin under heavy workload scenerios (up to +/-30%).
Now, here's what I think though. For those of you who only need SP3 for what it was "designed" for (portable work house specializing on office works, light media sorting, watching videos, school work, taking-notes, etc...), this isn't a problem.
But you have to realize what it means when you define "what it was designed for". Microsoft made it sound like the SP3 was going to be your all-in-one personal computer that's suppose to be faster than any other ultrabooks out there.
It clearly is not. Specially for younger people like me, I consider light gaming a must for a device of this caliber.
Let's face it. The ultimate dream that we all had when SP3 was first announced was the possibility of having a single all-powerful device that can replace my mac book and a tablet.
Ultimately, the core-i series CPU in the SP3 is it's major selling point over the baytrail counterparts- because you can actually run programs that the baytrail counterparts cannot handle. And now, if you're telling me "SP line was never designed for gaming. It's a thin-light portable work device", then why would you spend tripple the cost of a baytrail counterpart, if all you need to run is Office, web browsing, watching videos?
Anyways, I'm just playing devil's advocate here. I personally think the SP3 IS a better device (which is why I sold my SP2), but you can't just justify yourselves by denying a valid arguement that the counterpart has presented. I recently went back to the MS Store to verify that it wasn't just my SP3 that had thermal issues, and the sales rep already told me that MS acknowledges some of the throttling issues the SP3 has. Now, knowing MS, they'll probably provide a solution with some of the initial launch problems that we're seeing. We have to keep in mind that SP2 took ~6 months before being fine tuned. With the SP3, I'm sure MS's goal is to improve its' surface pro line, although I kinda feel like they could have waited 2.5 more months for broadwell launch. I'm not too sure if the SP3 will be replacing any MBAs out there yet, but with upcoming upgrades, I might expect more people buying the SP3 over MBA.