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Summoners, and the Eidolon in particular, are pretty dependent on what the opposition consists of. I've got an 8th level Summoner in PFS, and while I do limit my optimization some due to roleplaying, it's still pretty effective. However sometimes you run into places where the Eidolon just doesn't keep up. Enemies with DR are probably the biggest issue. Substance type DR will really gimp Eidolon damage (unless you have a weapon wielding one which is rare). I imagine you could get a +4 amulet of mighty fists to get past that, but that's big money.
I have a weapon wielding synth in PFS. Not an optimized build, but allows me to play the concept I want.