(3) MMS photo messages will sometimes come in as a video style play box. Very strange.
It does this so you can have more than one picture. You can then move between them.
(4) New Yahoo email alerts will sometimes pop up again after you have already read the new email.
I don't use yahoo, but I use gmail. After initially configuring the default email client to use both my work (exchange) and gmail, I set up the dedicated gmail client. This resulted in double notifications until I finally told the default email client to never check. I can still use it if I choose, just refresh it manually. I don't get a unified inbox this way, but the gmail client is more in tune with gmail (e.g., the "archive" button is not present in the default email client. It isn't perfect, but it works well enough.
(6) 512 Ram is not enough and can easily gets filled up.
This is the single biggest con on the phone IMO. My girlfriend has an inspire. In most ways I greatly prefer the infuse (better screen, faster processor, etc) but on this one point the inspire's extra 256k makes a big difference. Some games take much longer to start up on the infuse (specifically "Cut the Rope" is bad). I get force closes in some apps that never do that on hers. Most of these do it on initially booting, so not like I lose work in progress, and the next time (immediately after) they start up just fine.
(7) No dedicated camera button.
Yeah I briefly used a samsung focus before settling on the infuse and that's like the one thing I miss. Are there any roms that can hack this onto the volume buttons for at least taking the pic (if not starting the camera)?
(9) Copy and Paste is not as good as IPhone.
That is an android issue, not an infuse issue...
(10) No kickstand like EVO 4G or Thunderbolt which would come in handy for watching movie/music videos on an airplane or video chatting from a table or desk.
Surely some cases can do that. I made a doodad out of cardboard and a binder clip that works.
All in all though I think it was the best phone available on AT&T at the time for me. When the Thrill and Attain come out that may no longer be the case... but hey that's life in the world of smartphones.
None of these cons offset the positives of the phone, nor does it drive me crazy or anything like some of the other phones i've used.