You will get your face melted by the many battlemasters and war heros. The grind to get gear will be painful.
However, if you accept that you're going to die, a lot, it can be fun. I'm rank 52 right now on valor, i only have about 4-5 champion gear pieces, and I still die a ton. However I'm still useful using my Sorc pull in Huttball and my knockback. Knockback > dps in a lot of situations. I average about 5 medals per match. Sometimes more, never less than 4. Frustrating at times but overall I still love SWTOR pvp.
Bottom line, it's a grind. For those of us late to the game (when I logged on for the first time there were already battlemasters on the server) it's a wee more difficult. /shrug