My feylock has Unseen Servant basically so it can feed him grapes when he's not busy killing bad guys. 
Besides the dreadful invocations that take a precious spell slot (who's idea was that?) my only qualm really about Warlock is the Fey Lineage. It's mechanically very similar to Great Old One but it's bonus abilities (save the 1st lvl one) are almost identical but quite significantly weaker, requiring things like concentration when a similar GOO ability does not, or being blocked via saving throw where the GOO never is.
I still chose to play one because thematically I like them best and 4e feylock was my favorite.

Besides the dreadful invocations that take a precious spell slot (who's idea was that?) my only qualm really about Warlock is the Fey Lineage. It's mechanically very similar to Great Old One but it's bonus abilities (save the 1st lvl one) are almost identical but quite significantly weaker, requiring things like concentration when a similar GOO ability does not, or being blocked via saving throw where the GOO never is.
I still chose to play one because thematically I like them best and 4e feylock was my favorite.
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