Your latest comic "WTF" is actually somewhat of an improvement over the ones I saw before. It's still not a particutlarly great strip, but I would probably give it a 3 or 4 before moving on (as opposed to just hitting the stripcreator.com link at the top of the screen to refresh the page without voting).
I liked the punchline, but felt that the two panels preceeding it could have benefitted by having the two characters talk about something more esoteric... perhaps with shades of the bizzare, illegal, or sexually deviant.
Your "Bill" comic was also one of the better ones, but I can't say as it's stunning in its humor value. Jon asking the narrator for pizza kind of killed the humor for me... I've read a lot of strips, and I find that such an unneccisary addition in a punchline has that effect almost every time.
The only other one I'll comment on is your first one. It's a peeve of mine to see half a bench hanging in midair... it's another peve of mine to see combustion jokes, and I think that only a very few people ever do them justice. I personally have only done one combustion joke (that I can remember) and it was this...
[Click to view comic: 'The Wrong thing to say (to DragonXero)']
Even though I think it's funny, I realize that it might be too much to ask that not only should 100% of my readers get the metalhead humor, but that it sadly is too much to ask that 100% of them know the meaning of the word "Immolation."