Quick overview of my specs, first:
i5 firstname.lastname@example.org (no OC)
8 GB RAM@1333
GTX 770 2GB OC edition from Asus with latest official DX11 optimized drivers (not very overclocked but a bit, just as it comes from Asus, I don't need to OC it more since it's powerful enough for what I play)
Windows 7 64 bit.
Using 2x WD Caviar Blacks on raid 0 where the game is installed (the raid peaks at around 225 MB/s reading speeds)
Most relevant ingame settings I customized are view distance, which I have on the mid (588 I think), and shadows on medium, the rest is the highest possible, playing at 1920 by 1080, vertical FoV at 65 (since it can affect performance, it's relevant to mention it).
So well, I can see the performance is better than it was on the betas, at least for me. It's still not there yet, as most people point out, FPS are very spiky at times. Questing at the moment in Whitevale is fine, around 50-60 FPS in combat.
But yeah, doing 5 man dungeons FPS tend to fluctuate a lot, they don't go too low but certainly they don't stay at 60 FPS or something like that. Special effects from skills might be the cause, since dungeons don't usually have huge open spaces like a normal big zone has, so view distance shouldn't be affecting me inside a dungeon that much, at least the one I did (Stormtalon's).
Then we have Thayd, performance there is all over the place and I feel the game is loading stuff almost everytime, and specially when moving from one part to another within the city. Might be related to HD usage, or that the CPU can't handle all the NPC and players present at the same time. Since my setup is 3 years old, it's not that bad, since i get anything between 30 and 40 something FPS in Thayd which for a major city in an MMO is pretty ok, but the asset loading issue makes it a bit choppy for a couple seconds when moving around.
On 10 man PvP battlegrounds performance seems pretty irregular aswell, it depends on how many players there're on screen. Again, special effects might be causing issues, not too bad tho, it's playable but could improve.
Overall, from my point of view and having experienced how the game ran 3-4 months ago in beta, it's better, but it's still underperforming I feel.
Granted, this same machine (except the GPU, I had a 560 non TI 3 years ago) ran SWTOR in 2011 and that game had some issues as well, which most were fixed later. Wildstar is nowhere as bad performance wise, at least for me. I remember 9 FPS in SWTOR's open PvP planet and <30 FPS in some warzones because they were pretty unoptimized at launch and our HD's were reading assets the whole time. Good days, I guess
Furthermore, I think server load might be affecting performance at some peak hours, but I haven't bothered to properly test this yet.
So that's about it when it comes how the game runs for me, I'm holding up a PC upgrade which I wanted to do this summer, since most games I play still run pretty fine with my current setup but yeah, I usually do a CPU-mobo upgrade after 3-4 years, and the time is around the corner again.