I don't think there are any that are bad, I know a few people who have had issues with the Orion Carbons and the HPI Plazma's but that was more related to keeping the pack balanced than to the performance.
I've always used IP (or IP manufactured) LiPo's and have no complaints. I puffed an old 30C LiPo after bouncing it off the voltage cutoff too many times (set it to 3.2V per cell as a minimum is my advice), and another 20C stick LiPo that died over the winter because I had left it plugged in to the ESC (it didn't burst into flames in case you were wondering). Newer 50C+ LiPo's seem to be solid performers regardless of brand.
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