Are you flexible in the class you play ? Or do you always just play  your class regardless of the game situation  

I do change it up depending on the situation, though I'll usually be playing Engineer destroying vehicles and often just change if my team's class balance is severely unbalanced, otherwise I trust others to deal with things I can't. When I change to recon though, it's usually with a shotgun and C4 though since I can't snipe.

I used to be, but I'm too much of s stars whore at the moment. Should go back to my old self.

Nah, I switch constantly all the time, depending on whats going on on the map. Even switch class equipement depending on what I feel is needed as well as what I feel like playing.  
Flexibility has served me well and won many a game. Relying on other people if you are not playing with people you know is asking for a loss.

Map dependent for me, and every class except recon.  Just can't really get into sitting and watching and picking.  And if I'm going stabbing on D or objective hunting on O then the other classes are better than a wookie w/a shotty or G3.  I think I'll work on the Recon class versus AI whenever that onslaught mode drops; I need the 10 motion mines especially.

Sometimes I do if my teammates aren't being effective enough.

Sniping if I want to feel badass, assault if I want to actually be useful, and engineer if I want to level up and feel strategic

I always change to depending on the situation. I just usually dont change to the medic. Because I play with randoms and they are all fools!! So.... no health packs for them!

Yup. Being flexible is a must for good Battlefield players. If you stick to much to a single role, you will hinder your team. In fact, thats why you have a suicide option. 
Its also something that you have to constantly change, depending on the map and objective.

Yeah, sometimes I have trouble deciding which class to play, I used to only stick to assault, but I branched out once I got used to each class's weapons. 
 
That was a month ago, however.

If there's no medic in my squad I might play as one to keep everyone alive, but usually I just play as engineer. 

Medic if i want to level up, and assault if i defend a point. Just discovered going engy with an m14 which seems to work quite well, nice medium-long range

I've been playing for achievements/unlocks lately, But before when i was just playing I was pretty much an engineer all the time because there was an excess of medics and recons. I've started loving playing as a medic lately though

ill play anything, whatever is needed

Yes, almost always. Depending on the map tier if on Rush as well.

I often switch up between assault and engineer when the need for it arises, but the rest f the time medic. Sometimes a medic isnt any use to a team that needs their tank repaired.

If the rest of my team is doing really well, I just go ahead and get stars. Otherwise I gotta carry them all to get our scores back up.

yeah I like them all. But I usually play engineer.

I just play engi, because I like SMGs and people who do nothing about tanks annoy me.
I'm also pretty accurate so running into a base and planting is as easy as being an assault class, apart from not having a noob tube, but that's a different story.

I usually base it on how the game is going and how my team is playing as a whole.

The best players are the ones who master all the classes. I used to be oookay at BFBC1, never used the specialist EVER (I know, right, insane?). But then I decided "man, I should stop being a fool and try this junk out." -- Long story short, I had a K/D of around 2.1 on Specialist alone (versus my 1.6 average at the time). It's a good idea to switch up for whatever situation is thrown at you.

I find the classes that I use are good for almost all situations, hardcore and regular.  Including rushing bomb sites, never underestimate the pistols :)  my best friend when recon.
 
-Assault, G3, M9 pistol, C4, extra C4, Magnum ammo
-Recon, Rifle, M9 pistol,  C4, 12x, Magnum ammo
 
The only thing I'm almost completely useless against is helicopters, so I usually rely on my team to deal with them.

The enemy snipers had reach.
 
...
 
But I had flexibility.

I'd say so, but more often than not I'm Medic on Defense and Recon on Offense. Tagging targets and sniping is what I'm best at, so I end up falling back on it if there aren't already 10 snipers. It's kind of annoying now since I'm not unlocking anything for Recon or Vehicles.

I change my classes if i often die in this order:

• Assault
• Medic
• Recon
• Engineer