I think they are starting to become my favorite grenade type, if you get one stuck between multiple people, it can do a lot of damage and it is great for slagging multiple people for an extended period of time.
as far as rubberized goes, I used to hate them, but there are certain grenade types I really like rubberized. I like MIRV and really any standard elemental grenade rubberized, as long as they have a 0 fuse time, but I think all rubberized grenades work like they have 0 fuse time, right? Detonate as soon as it contacts an enemy?
I tend to only use bouncing betties if they are of the slag variety, but then again I don't have a bouncing bonny or anything :(
As for rubberized, it's usually either a tesla or fire burst (I think that's what the fire version of a tesla is) Every time I've found a Mirv variety it's generally always been outclassed by what I have been using so I never bothered too much with them.
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Bouncing Betty grenades are my favourite type, but I don't often use them particularly because I play on an Axton mainly right now which is explosive build. But I think they're hugely underrated. I like them mostly because I love to watch the numbers fly. >:)
Rubberized grenades are the stupidest thing ever, though. Uuuuugh I can't stand them.
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The Legendary "Bouncing Bonnie" grenade is one of my favorite grenades. Shoots the bullets as usual, but systematically lobs child grenades in a multitude of directions as it does so. Pretty damn effective.
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Never used bouncing betty in BL2 until a few hours ago(one of the last things i needed for achievement). I didn't see anything great about it. It looks like it would work good in crowd control, but other grenades feel like they are more reliable then bettys.
The only grenade I use is breath of terra.
I also am warming up to the fastball that I found in one of the final chest at the end of Hammerlocks DLC. Great fuster cluck grenade.
I wouldn't mind 'rubberised' grenades if they only started bouncing after landing. Like a lobbed grenade, but starts bouncing on impact. I can't throw them over cover, no matter how high I aim, because they zip to the ground to start bouncing. Afterwards, they just bounce off of cover, and I get no use out of it.
I don't get much use out of Betty grenades, but I've found the Crossfire to be pretty good. I bought a corrosive longbow crossfire the other day. Works nicely.