The R Series Rangers have quite a following by their owners. Some even consider them to be the best combo of smooth ride & best speed (bare in mind we're STILL talking Ranger speed) of any hull they've ever released. I spent considerable time fishing out of an R93 and loved it. For reference, on the R Series, a "1" (i.e. R71, R81, R91) designation means it's a single console and a "3" (i.e. R73, R83, R93) designation means it's a dual console.
To answer your question of whether it's too small, that would be for you to decide. Here's some R71 specs for you, mallard...
Length - 17'1"
Width - 83"
130 hp max
1125 lbs hull wght
24 gallon fuel capacity