Like the title says i am coming back to play SWG and i was wondering what is under/over played prof and what professions are nerfed or over powered? etc etc. Any information or quick tips will help thanks.

Smugglers and spies are underplayed, Jedi and commandos are probably the most overplayed.

They actually have different roles now, so I'd pick what you like rather than what is the Flavour of The Month.  The nerfed/buffed changes with time really, but I'd say Jedi and commando are pretty strong professions if you're good at them and know what you're doing.  Just check the roles they have though, 'cause you might have more fun with one of the underplayed professions.

Spies are amazing PVPers now ..

yes spy can be very rewarding, more suited for a solo pvper IMO, but can also be built to please group members if thats your thing..

there are alot of commandos.  there are a few commando/beastmasters.  they are gnarly when buffed up.

there are alot of bounty hunters, some are scary, most are not..

theres some medics.. i don't prefer to unclaok ambush them, they heal off my spike dmg too fast, same with light jedi- except theres alot more of them.

theres many dark jedi, these i prefer to ambush 1vs1- they can't heal off my spike dmg fast enough- other players want them nerfed tho i guess..  1 tried to force drain me, and lightning me, but i had my dodge selfbuff up..

thers some officers- they do good spike dmg.  another class i might ambush- depending on who's playing the officer 

smugglers can be way good but they take much thought.  hardly any of them- the most challenging prof some say- but has some of the coolest things that make players go "woa, smuggler does that??"  another class i might ambush but smuggler has the only true stun now that can really ruin spies day.   new rule of thumb is u don't get close to a smugglr

I usually check out http://swg.activeframe.de on a regular basis. While it doesn't really provide a picture of the PVE playerbase, it does give a rough indication of what professions have problems and which ones doesn't.

PVP'ers tend to shy away from broken professions and take the ones they can have success with.

There is alot of RP'ers that picks immersive professions, smuggler is propably the one with the highest RP population, allthough we are successfull in both PVE and PVP with the Game Update 4 we got in spring 2008 that focused on combat viability.

Its all about roles though, understanding what your profession is capable of and setting the expectations accordingly helps alot. For example I wouldn't expect a spy or smuggler to be able to tank a CL90 Ancient Krayt.

LS jedi is the PVE king, can do anything solo, except heroics and some instances that need more than 1 person for other reasons like DF1 and DF2