Should I get this or just wait for Tekken Tag 2?

It's 27 euros for the PS3 but I heard that the online was pretty fucked during launch..has it been fixed?

Does the gem buying situation make the game feel like a Pay 2 Win game?

I don't have a fight stick and I did alright in SF4. Am I going to get my ass kicked without it in this one?

Online is fine, last time I played they seemed to have fixed all of the sound issues that people were complaining about.
From what I played gems were never an issue, there isn't one completely overpowered gem.
You'll be fine without a fight stick.
 
Though I'd wait for Tekken Tag 2. I liked this game enough at launch, but the more I played of it the worse it seemed to get. It's just kind of boring, and a lot of matches end in timeouts with people just jabbing over and over until they can get a hit. Have a look at some matches to see if you like the look of it.

The online was fixed like a month after launch so it should be fine. 
  
As for Tekken Tag 2, I would wait for reviews before you dive head first.  
 
When I played online, It was usually against people that used the autoblock gem so you should do fine.

Yeah. I think I'll wait and see if TT2 is any good and then I'll get SFXT if it sucks.

I'd say just jump into Tekken Tag 2.

Tekken tag 2:

Tekken Tag Tournament 2 — 39/40

Persona 4: Arena — 36/40

Super Street Fighter 4 — 35/40

Street Fighter X Tekken (PS3) — 35/40

Street Fighter 4 — 34/40

Street Fighter X Tekken (360) — 34/40

Marvel vs. Capcom 3 — 33/40

Ultimate Marvel vs. Capcom 3 — 33/40

This is the list of ratings from Famitsu magazine in Japan, highest fighting game score in a decade!

Not even a Tekken fan but I'd play pretty much anything over SFXT and TTT2 looks really stellar.

I just had a dream of STREET FIGHTER 5... it was better than sfxt.

It depends, do you like Street Fighter games? If you're more familiar with Tekken games I'd suggest just waiting for TTT2.

The pro community is in flux but there are ALWAYS games online for SFxT. And it's cheap as dirt.

TTT2 looks amazing though.