Feel is important. Scales are important. Speed is important - use this with care and caution.
While you can get by with the pentatonic, feel and and not much speed, you'll have lots more options handy if you knew more scales, be able to play fast (only when required) and do these with feel.
Different scales help you to express yourself musically in ways that say the pentatonic can't. Scales played at different speeds emit different moods. Different scales allow for more expressive options available to you.
Of course do it all with feel and it'll be lots better.
Lastly, don't lean too many scales at the same time. Give yourself time to get acquainted to the one that you are learning. Learn to express yourself with this one scale or mode before moving on.
Scales on their own do nothing for you if you can't play with feel and/or you can't change your playing speed to emit different moods.
Cheers & Have Fun!
RoRK