I'm not surprised at all, especially the signature discrepancy, but I wouldn't expect anything better from any other Singapore bank. I've had lots of 'signature discrepancy' disputes at DBS also, even when I sign something in front of them and have my passport.
I've transferred much more than $1000 (but never more than $10000 USD) in at one time with Citi many times. As for ATMs, they share a network with Maybank / HSBC / SCB and one other bank whos name escapes me. No fees, etc, so it helps with finding an ATM. (And if it doesnt, almost every MRT station has a Citi ATM).
Not trying to dispute what you say Dert, but I think it's just a typical Singapore thing and despite your bad experiences there still isn't a *better* alternative for us. If there is, I'd love to know