i don't think they're all that bad. these three i likey:
/comics/myles1890/379571/
/comics/myles1890/379573/
/comics/myles1890/379569/
better punchlines would help some of them though, like bipedophile said. but you've only made around 50 comics. i wouldn't beat yourself up too much. we all got better as we went. there was even a thread where everyone posted their first comic so we could all wallow in the suckiness of them. just keep writing what you find funny and you'll be fine