There will be plenty of classes depending on how you want to play. Teamwork and tactics will have to be applied especially on long raids and strikes. I hate dying and ike doing something once and reaping the rewards. Each class is like putting a puzzle together. Each character is shaped differently and the people that learn how to use their guardian in pvp and pve will stregthen the group considerably. I wouldnt mind a firteam of 3 titans but we would be lacking in long range damage and tactics since. Each of the classes complememet each other in such a way that it is best to diversify. Strength in numbers a diversirty. The element of knowing someone else has a super or ability that could get me out of trouble yet give them the ability to hold thier own is priceless.

Ultimately no class is a beginner class as the titan has a tough jump ability that seem vulnerable and is usually good for gettin in the fray first with high AOE abilities. The warlock jump is good for coordination and clearing with AOE abilties and the hunters jump is great for getting to high ground quickly while mainting a foot on the ground and with abilites with low AOE the hunter plays support.

Titan - Damage core - close range Warlock - Logistics, coordination medium range, clearing Hunter - Support long range, scout, backup.

I'd say for subclasses not the classes themselves each subclass has different roles. Striker/ close range aoe damage dealer Gunslinger/high and accurate single target damage Voidcaller/longer range aoe damage