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Even so, +2 to all stats for a relic is too overpowered.
No, it's fine. Look at other artifacts with stats – major artifacts give +5 or +6 to stats (the Dragon Armor in The Restoration of Erathia is a relic).
And relics starting from +8 (take, for example, pieces from the Titan set). So, the sandals fit perfectly into this pattern.
The problem with the sandals isn't that they give too little, but that the bonus is spread across stats, so there isn't such a clear effect as, for example, from the cuirass.