I know this will sound very "clichê", but guardians are very versatile when it comes to playstyle. I used to doubt it, but when i started to test out some builds, i realized that it can either play a great dps (not as good as warriors, but with decent criticals) or a bunker tanker.
Answering your question : Yes, guardians are very good on 1v1, no matter which profession you are facing. Even tho there are some harder classes like Rangers, you will have a arsenal of choices to pick against each class.
At the moment, i am using a very fun build, that have constant damage flow and is capable of very good criticals (over 3.5k criticals using Zealot's defense if it crits).
I've played some bunker builds aswell like Staff + Hammer but using Critical Based atacks, i was able to crit over 6k with the hammer leap skill after charging Staff's number 4 skill. It was brutal but a little glass cannon to me.
This is the build i am using at the moment for sPvP and Tournaments : http://en.gw2skills....Nuak1soYQxmgJBA
Just to help you out :
. Monk's Focus : Heals you for about 2.3k for each meditation you use
. Both meditations (+Signet Passive) makes you almost imune to conditions
. Voice of Purity can really turn the table against condition based necromancers
. Instant meditations are awesome
. Use your scepter for ranged atacks and kiting. Imobilize is very usefull when used after smite (yes, after, not before)
. For finishing up Use Focus 5 skill, change to sword and them, Teleport and use Zealot Defense for heavy burst on them
. This can be played very defensively due to Stand your Ground Utilty (Retaliation + Stun Imunitty vs warriors and Thiefs is very useful)
Thats what i can say, feel free to PM me if you have some questions, i might not be the best, but i'm not a noob
First Post o/ !