Seriously.
It's typical fanboy hate, he's gotten too much exposure so he's an easy target for people to talk **** about, "OMG, he's in everything, he's the suxor". Kind of like how people are *****ing about Depp being in so many Burton films even though he's a great actor and plays a different character each time.
To me I'm not sure if I can see Bale as Lestat but I do think he's a damn good actor and it's only because he goes after somewhat similar characters(deep personal issues, not upbeat at all) is why I think some people think he sucks. If they could actually tell a subtle actor/performance from your typical style of overacting in Hollywood they might have a bit more respect for him though since his performances have all been different even if they characters are similar at times.