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A good skill build takes into account both the preferred style of play and ways to maximize advantages for those roles. Solo play in particular requires a class build that pays some attention to survivability, unless capable of healing oneself quickly. A Sorcerer, while great at ranged DPS, will need to make sure their Light Armor, pet and attack skills are up to snuff, whereas a Dragonknight will want to upgrade skills for heavy armor, shields and melee weapons.
PvP build choices in Elder Scrolls Online come down to group size and preferred role as well. Some players may see themselves as primarily solo hunters that occasionally like to contribute to a siege, whereas others may be getting together regularly with friends or guildies. For example a class specd for heals is very important to all groups, but could focus more on damage or control if play is mostly going to be solo (or if your guild has too many healers that day). A class used primarily for single-target DPS may wish to allocate points to aid any AOE abilities they have if part of a regular siege group.
Different zones will feature different types of combat; knowing the general types and numbers of combatants you will face can make a difference in the type of skill point allocation youll want in Cyrodiil.
For group PvE builds a player should decide what role they like to play in groups, and allocate skill points accordingly. Whereas a solo player may have to allocate more points to skills that enhance their survivability, group builds should specialize in abilities that allow players to fulfill their job in the group. These roles tend to focus on healing, controlling enemies, tanking to keep others from being hit or damaging enemies.
When forming groups for adventuring in the rest of non-Cyrodiilic Tamriel, a balance of roles will be needed (and this will change based on the type of content, how well geared the players are etc.). Generally, all groups need at least one character with tanking skills, some with damage dealing skills, and some that can heal. If the dungeon in question is filled with trolls (or your party got wiped in a dungeon by trolls!) you can go in with more Nightblades to tank, but if the enemies are mostly skeletal archers and other distance attackers you can swap out some of them or the Dragonknight warriors for Sorcerers.
Any thoughts on these?