While a level 15 drow may be as good as a level 18 human, a level 1 drow is nowhere near as powerful as a level 4 of a non ECL race.
Maybe it could be considered to have a racial ECL increment at 10% per level? A drow would start with and ECL of 0.3 at level 1, 0.6 at level 2, 0.9 at level 3, 1.2 at level 4 and so on until 3.0 at level 10. It would help the ECL races get by the first few levels a bit quicker without having much impact on their overall rate of advancement.
In a pvp server, nothing is more annoying than being unable to assist when your faction is under attack. By level 6 or 7 most characters can start to help in some manner, even if it is just buffing, healing or getting the attention of some ungodly summon and then running like the wind.

A gradual scale for ECL would allow characters of such races to reach this level a bit easier while still making them work much harder in later levels when (for the most part) their racial bonuses really start to shine.